UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-Q QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANY Investment Company Act file number 811-06660 Name of Fund: BlackRock MuniYield Quality Fund, Inc. Fund Address: P.O. Box 9011 Princeton, NJ 08543-9011 Name and address of agent for service: Robert C. Doll, Jr., Chief Executive Officer (principal executive officer), BlackRock MuniYield Quality Fund, Inc., 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011 Registrant's telephone number, including area code: (800) 882-0052 Date of fiscal year end: 10/31/2007 Date of reporting period: 05/01/2007 - 07/31/2007 Item 1 - Schedule of Investments BlackRock MuniYield Quality Fund, Inc. Schedule of Investments as of July 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- Alabama - 0.7% $ 3,000 Jefferson County, Alabama, Limited Obligation School Warrants, Series A, 4.75% due 1/01/2025 $ 3,025 ----------------------------------------------------------------------------------------------------------------------------------- California - 18.3% 4,150 Alameda Corridor Transportation Authority, California, Capital Appreciation Revenue Refunding Bonds, Subordinate Lien, Series A, 5.45% due 10/01/2025 (a)(n) 3,417 1,250 Anaheim, California, Public Financing Authority, Electric System Distribution Facilities Revenue Bonds, Series A, 5% due 10/01/2031 (f) 1,292 2,200 Arcadia, California, Unified School District, Capital Appreciation, GO (Election of 2006), Series A, 4.96% due 8/01/2039 (f)(n) 429 3,250 Cabrillo, California, Community College District, GO (Election of 2004), Series B, 5.20% due 8/01/2037 (g)(n) 699 7,405 Cabrillo, California, Community College District, GO (Election of 2004), Series B, 4.87% due 8/01/2038 (g)(n) 1,512 2,790 California State, GO, 5.50% due 4/01/2014 (h) 3,063 5 California State, GO, 5.50% due 4/01/2028 5 4,450 California State, GO, Refunding, 5.25% due 9/01/2010 (h) 4,643 30 California State, GO, Refunding, 5.125% due 6/01/2027 31 3,450 California State University, Systemwide Revenue Bonds, Series A, 5% due 11/01/2035 (d) 3,556 10,000 California State, Various Purpose, GO, 5.25% due 11/01/2029 10,482 3,200 California State, Various Purpose, GO, 5.50% due 11/01/2033 3,421 3,875 Chabot-Las Positas, California, Community College District, GO (Election of 2004), Series B, 4.812% due 8/01/2025 (a)(n) 1,607 1,200 Chino Valley, California, Unified School District, GO (Election of 2002), Series C, 5.25% due 8/01/2030 (g) 1,274 3,525 Coachella Valley, California, Unified School District, GO (Election of 2005), Series A, 5% due 8/01/2028 (d) 3,666 2,150 East Side Union High School District, California, Santa Clara County, GO (Election of 2002), Series D, 5% due 8/01/2026 (b) 2,241 1,230 Fresno, California, Unified School District, GO (Election of 2001), Series E, 5% due 8/01/2030 (f) 1,283 1,600 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series B, 5.50% due 6/01/2013 (b)(h) 1,731 5,000 Hacienda-La Puente, California, Unified School District, GO (Election of 2000), Series B, 5% due 8/01/2027 (f) 5,178 4,000 Metropolitan Water District of Southern California, Waterworks Revenue Bonds, Series B-1, 5% due 10/01/2029 (d) 4,147 2,275 Metropolitan Water District of Southern California, Waterworks Revenue Bonds, Series B-1, 5% due 10/01/2036 (d) 2,343 Portfolio Abbreviations To simplify the listings of BlackRock MuniYield Quality Fund, Inc.'s portfolio holdings in the Schedule of Investments, we have abbreviated the names of many of the securities according to the list below. AMT Alternative Minimum Tax (subject to) COP Certificates of Participation DRIVERS Derivative Inverse Tax-Exempt Receipts EDA Economic Development Authority GO General Obligation Bonds HDA Housing Development Authority HFA Housing Finance Agency IDA Industrial Development Authority IDB Industrial Development Board IDR Industrial Development Revenue Bonds PCR Pollution Control Revenue Bonds S/F Single-Family BlackRock MuniYield Quality Fund, Inc. Schedule of Investments as of July 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- $ 2,000 Mount Diablo, California, Unified School District, GO (Election of 2002), 5% due 7/01/2027 (d) $ 2,070 2,750 Orange County, California, Sanitation District, COP, 5% due 2/01/2033 (d) 2,817 2,000 Poway, California, Redevelopment Agency, Tax Allocation Refunding Bonds (Paguay Redevelopment Project), 5.125% due 6/15/2033 (a) 2,061 2,100 Sacramento, California, Unified School District, GO (Election of 2002), 5% due 7/01/2030 (g) 2,183 9,000 San Diego County, California, Water Authority, Water Revenue Refunding Bonds, COP, Series A, 5% due 5/01/2032 (g) 9,258 2,725 San Mateo County, California, Community College District, GO (Election of 2001), Series A, 5% due 9/01/2026 (d) 2,814 1,950 Tamalpais, California, Union High School District, GO (Election of 2001), 5% due 8/01/2028 (f) 2,014 3,150 Ventura County, California, Community College District, GO (Election of 2002), Series B, 5% due 8/01/2030 (g) 3,274 ----------------------------------------------------------------------------------------------------------------------------------- Colorado - 3.9% 1,650 Colorado Health Facilities Authority Revenue Bonds (Catholic Health Initiatives), Series A, 5.50% due 3/01/2032 (c) 1,749 1,600 Colorado Health Facilities Authority Revenue Bonds (Covenant Retirement Communities Inc.), Series A, 5.50% due 12/01/2027 (j) 1,660 1,000 Colorado Health Facilities Authority Revenue Bonds (Covenant Retirement Communities Inc.), Series A, 5.50% due 12/01/2033 (j) 1,031 9,000 E-470 Public Highway Authority, Colorado, Capital Appreciation Revenue Refunding Bonds, Series B, 5.485% due 9/01/2029 (g)(n) 2,866 11,125 Northwest Parkway, Colorado, Public Highway Authority (Convertible CABS), Revenue Bonds, Series C, 5.345% due 6/15/2025 (f)(n) 10,132 ----------------------------------------------------------------------------------------------------------------------------------- District of Columbia 5,700 District of Columbia, GO, Series A, 4.75% due 6/01/2036 (d) 5,722 - 1.8% 1,930 District of Columbia, Revenue Refunding Bonds (Catholic University of America), 5.625% due 10/01/2009 (a)(h) 2,020 570 District of Columbia, Revenue Refunding Bonds (Catholic University of America), 5.625% due 10/01/2029 (a) 593 ----------------------------------------------------------------------------------------------------------------------------------- Florida - 3.9% 2,235 Beacon Tradeport Community Development District, Florida, Special Assessment Revenue Refunding Bonds (Commercial Project), Series A, 5.625% due 5/01/2032 (j) 2,336 2,065 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Bonds (Adventist Health System), Series C, 5.25% due 11/15/2036 2,088 4,700 Highlands County, Florida, Health Facilities Authority, Hospital Revenue Refunding Bonds (Adventist Health System), Series G, 5.125% due 11/15/2032 4,729 3,000 Miami-Dade County, Florida, Aviation Revenue Refunding Bonds (Miami International Airport), AMT, Series A, 5% due 10/01/2040 (b) 3,042 5,200 Orange County, Florida, Sales Tax Revenue Refunding Bonds, Series B, 5.125% due 1/01/2032 (d) 5,387 ----------------------------------------------------------------------------------------------------------------------------------- Georgia - 5.4% 3,500 Atlanta, Georgia, Airport Passenger Facility Charge and Subordinate Lien General Revenue Refunding Bonds, Series C, 5% due 1/01/2033 (f) 3,595 4,270 Atlanta, Georgia, Water and Wastewater Revenue Bonds, 5% due 11/01/2034 (f) 4,411 1,200 Atlanta, Georgia, Water and Wastewater Revenue Bonds, Series A, 5% due 11/01/2033 (g) 1,234 BlackRock MuniYield Quality Fund, Inc. Schedule of Investments as of July 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- $ 1,675 Atlanta, Georgia, Water and Wastewater Revenue Bonds, Series A, 5% due 11/01/2039 (g) $ 1,714 5,000 Augusta, Georgia, Water and Sewer Revenue Bonds, 5.25% due 10/01/2034 (f) 5,268 2,820 Augusta, Georgia, Water and Sewer Revenue Bonds, 5.25% due 10/01/2039 (f) 2,962 4,785 Monroe County, Georgia, Development Authority, PCR, Refunding (Oglethorpe Power Corporation-Scherer), Series A, 6.80% due 1/01/2011 5,196 ----------------------------------------------------------------------------------------------------------------------------------- Hawaii - 0.5% 2,000 Hawaii State, GO, Series CX, 5.50% due 2/01/2021 (f) 2,118 ----------------------------------------------------------------------------------------------------------------------------------- Illinois - 15.7% 5,000 Chicago, Illinois, GO (Lakefront Millennium Parking Facilities), 5.125% due 1/01/2009 (g)(h) 5,189 2,500 Chicago, Illinois, GO (Lakefront Millennium Parking Facilities), 5.75% due 1/01/2012 (g)(h) 2,734 3,400 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2, 5.75% due 1/01/2023 (f) 3,678 4,000 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2, 5.75% due 1/01/2024 (f) 4,327 3,300 Chicago, Illinois, O'Hare International Airport Revenue Bonds, Third Lien, AMT, Series B-2, 6% due 1/01/2029 (b) 3,633 3 Chicago, Illinois, O'Hare International Airport, Revenue Refunding Bonds, DRIVERS, AMT, Series 250, 7.505% due 1/01/2021 (g)(i)(m) 3 2,665 Chicago, Illinois, O'Hare International Airport, Revenue Refunding Bonds, Third Lien, AMT, Series A-2, 5.75% due 1/01/2021 (f) 2,883 5,080 Cook County, Illinois, Capital Improvement, GO, Series C, 5.50% due 11/15/2012 (a)(h) 5,480 28,525 Illinois Sports Facilities Authority, State Tax Supported Revenue Bonds, 5.212% due 6/15/2030 (a)(n) 26,492 5,500 Illinois Sports Facilities Authority, State Tax Supported Revenue Bonds, 5% due 6/15/2032 (a) 5,635 7,000 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Refunding Bonds (McCormick Place Expansion Project), 5.50% due 12/15/2024 (d) 7,291 3,500 Metropolitan Pier and Exposition Authority, Illinois, Dedicated State Tax Revenue Refunding Bonds (McCormick Place Expansion Project), Series B, 5.75% due 6/15/2023 (g) 3,773 ----------------------------------------------------------------------------------------------------------------------------------- Indiana - 2.7% 6,470 Indianapolis, Indiana, Local Public Improvement Bond Bank, Revenue Refunding Bonds (Indianapolis Airport Authority Project), AMT, Series B, 5.25% due 1/01/2028 (g) 6,756 5,055 Indianapolis, Indiana, Local Public Improvement Bond Bank, Revenue Refunding Bonds (Indianapolis Airport Authority Project), AMT, Series B, 5.25% due 1/01/2030 (g) 5,268 ----------------------------------------------------------------------------------------------------------------------------------- Louisiana - 7.1% 5,100 Louisiana Local Government Environmental Facilities and Community Development Authority, Revenue Bonds (Capital Projects and Equipment Acquisition), Series A, 6.30% due 7/01/2030 (a) 5,946 2,800 Louisiana State Citizens Property Insurance Corporation, Assessment Revenue Bonds, Series B, 5% due 6/01/2023 (a) 2,915 BlackRock MuniYield Quality Fund, Inc. Schedule of Investments as of July 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- $ 7,300 Louisiana State, Gas and Fuels Tax Revenue Bonds, Series A, 4.75% due 5/01/2039 (f) $ 7,310 4,675 Louisiana State Transportation Authority, Senior Lien Toll Revenue Capital Appreciation Bonds, Series B, 5.31% due 12/01/2027 (a)(n) 1,631 6,150 New Orleans, Louisiana, Ernest N. Morial Exhibit Hall Authority, Special Tax, Sub-Series A, 5.25% due 7/15/2028 (a) 6,405 5,000 New Orleans, Louisiana, Ernest N. Morial Exhibit Hall Authority, Special Tax, Sub-Series A, 5% due 7/15/2033 (a) 5,106 800 Rapides Financing Authority, Louisiana, Revenue Bonds (Cleco Power LLC Project), AMT, 4.70% due 11/01/2036 (a) 769 1,900 Terrebonne Parish, Louisiana, Hospital Service District Number 1, Hospital Revenue Bonds (Terrebonne General Medical Center Project), 5.50% due 4/01/2033 (a) 2,027 ----------------------------------------------------------------------------------------------------------------------------------- Maryland - 1.7% 7,115 Baltimore, Maryland, Convention Center Hotel Revenue Bonds, Senior Series A, 5.25% due 9/01/2039 (b) 7,493 ----------------------------------------------------------------------------------------------------------------------------------- Massachusetts - 8.3% 3,730 Massachusetts Bay, Massachusetts, Transportation Authority, General Transportation System Revenue Refunding Bonds, Series A, 7% due 3/01/2011 (g) 4,117 3,550 Massachusetts Bay Transportation Authority, Revenue Refunding Bonds (General Transportation System), Series A, 7% due 3/01/2014 (g) 4,083 11,400 Massachusetts Bay Transportation Authority, Sales Tax Revenue Refunding Bonds, Senior Series A-2, 4.80% due 7/01/2032 (n) 3,282 3,400 Massachusetts Bay Transportation Authority, Sales Tax Revenue Refunding Bonds, Senior Series A-2, 5.115% due 7/01/2035 (n) 838 4,000 Massachusetts State, HFA, Rental Housing Mortgage Revenue Bonds, AMT, Series C, 5.60% due 1/01/2045 (f) 4,189 2,200 Massachusetts State, HFA, S/F Housing Revenue Bonds, AMT, Series 128, 4.80% due 12/01/2027 (f) 2,153 2 Massachusetts State Port Authority, Special Facilities Revenue Bonds, DRIVERS, AMT, Series 501, 6.999% due 7/01/2009 (a)(i) 2 14,400 Massachusetts State School Building Authority, Dedicated Sales Tax Revenue Bonds, Series A, 5% due 8/15/2030 (f) 14,979 2,400 Massachusetts State Special Obligation Dedicated Tax Revenue Bonds, 5.25% due 1/01/2014 (d)(h) 2,577 1,210 Massachusetts State Water Resource Authority, General Revenue Refunding Bonds, Series B, 5.125% due 8/01/2027 (g) 1,259 ----------------------------------------------------------------------------------------------------------------------------------- Michigan - 3.8% 2,350 Detroit, Michigan, Sewage Disposal System, Second Lien Revenue Bonds, Series B, 5% due 7/01/2036 (d) 2,428 2,300 Michigan Higher Education Student Loan Authority, Student Loan Revenue Refunding Bonds, AMT, Series XVII-G, 5.20% due 9/01/2020 (a) 2,361 1,000 Michigan State Hospital Finance Authority, Hospital Revenue Refunding Bonds (Oakwood Obligated Group), Series A, 5% due 7/15/2025 1,009 1,700 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds (Detroit Edison Company Pollution Control Project), AMT, Series A, 5.50% due 6/01/2030 (b) 1,798 BlackRock MuniYield Quality Fund, Inc. Schedule of Investments as of July 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- $ 3,300 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds (Detroit Edison Company Pollution Control Project), AMT, Series C, 5.65% due 9/01/2029 (b) $ 3,456 5,800 Michigan State Strategic Fund, Limited Obligation Revenue Refunding Bonds (Detroit Edison Company Pollution Control Project), AMT, Series C, 5.45% due 12/15/2032 (b) 6,065 ----------------------------------------------------------------------------------------------------------------------------------- Minnesota - 0.9% 4,190 Dakota County, Minnesota, Community Development Agency, S/F Mortgage Revenue Bonds (Mortgage-Backed Securities Program), Series B, 5.15% due 12/01/2038 (o)(p) 4,213 ----------------------------------------------------------------------------------------------------------------------------------- Nebraska - 2.0% 6,315 Municipal Energy Agency of Nebraska, Power Supply System Revenue Bonds, Series A, 5% due 4/01/2033 (f) 6,500 2,300 Washington County, Nebraska, Wastewater Facilities Revenue Bonds (Cargill Inc. Project), AMT, 5.90% due 11/01/2027 2,469 ----------------------------------------------------------------------------------------------------------------------------------- Nevada - 7.5% 4,100 Carson City, Nevada, Hospital Revenue Bonds (Carson-Tahoe Hospital Project), Series A, 5.50% due 9/01/2033 (j) 4,245 2,000 Clark County, Nevada, Airport System Subordinate Lien Revenue Bonds, Series A-2, 5% due 7/01/2030 (d) 2,056 19,100 Clark County, Nevada, Airport System Subordinate Lien Revenue Bonds, Series A-2, 5% due 7/01/2036 (d) 19,570 2,300 Clark County, Nevada, IDR (Southwest Gas Corp. Project), AMT, Series A, 4.75% due 9/01/2036 (d) 2,248 5,710 Washoe County, Nevada, School District, GO, 5.875% due 12/01/2009 (f)(h) 5,976 ----------------------------------------------------------------------------------------------------------------------------------- New Hampshire - 3.5% 10,000 New Hampshire Health and Education Facilities Authority Revenue Bonds (Dartmouth-Hitchcock Obligation Group), 5.50% due 8/01/2027 (f) 10,590 5,000 New Hampshire State Business Finance Authority, PCR, Refunding (Public Service Company), AMT, Series D, 6% due 5/01/2021 (g) 5,164 ----------------------------------------------------------------------------------------------------------------------------------- New Jersey - 4.4% 910 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.75% due 6/15/2029 969 1,385 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.50% due 6/15/2031 1,448 5,500 New Jersey EDA, Motor Vehicle Surcharge Revenue Bonds, Series A, 5.25% due 7/01/2031 (g) 5,816 3,860 New Jersey EDA, School Facilities Construction Revenue Bonds, Series O, 5.125% due 3/01/2028 4,016 7,500 New Jersey EDA, School Facilities Construction Revenue Bonds, Series O, 5.125% due 3/01/2030 7,798 ----------------------------------------------------------------------------------------------------------------------------------- New York - 5.9% 3,000 Metropolitan Transportation Authority, New York, Revenue Bonds, Series B, 5% due 11/15/2035 (g) 3,107 8,990 Metropolitan Transportation Authority, New York, Transportation Revenue Bonds, Series A, 5% due 11/15/2032 (d) 9,278 10,000 New York State Thruway Authority, General Revenue Refunding Bonds, Series G, 5% due 1/01/2032 (f) 10,377 3,570 Tobacco Settlement Financing Corporation of New York Revenue Bonds, Series A-1, 5.25% due 6/01/2022 (a) 3,753 ----------------------------------------------------------------------------------------------------------------------------------- Ohio - 2.2% 2,500 Columbus, Ohio, City School District, GO (School Facilities Construction and Improvements), 5.25% due 12/01/2014 (f)(h) 2,712 2,000 Jackson, Ohio, Hospital Facilities Revenue Bonds (Consolidated Health System-Jackson Hospital), 6.125% due 10/01/2009 (h)(j) 2,111 5,250 Ohio State Air Quality, Development Authority Revenue Bonds (Dayton Power and Light Company Project), 4.80% due 9/01/2036 (d) 5,171 ----------------------------------------------------------------------------------------------------------------------------------- BlackRock MuniYield Quality Fund, Inc. Schedule of Investments as of July 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- Oklahoma - 0.5% $ 1,000 Tulsa, Oklahoma, Airports Improvement Trust, General Revenue Bonds (Tulsa International Airport), AMT, Series B, 6% due 6/01/2019 (d) $ 1,045 1,000 Tulsa, Oklahoma, Airports Improvement Trust, General Revenue Bonds (Tulsa International Airport), AMT, Series B, 6.125% due 6/01/2026 (d) 1,048 ----------------------------------------------------------------------------------------------------------------------------------- Pennsylvania - 5.0% 9,000 Pennsylvania State Public School Building Authority, School Lease Revenue Bonds (The School District of Philadelphia Project), 5% due 6/01/2013 (f)(h) 9,522 6,000 Pennsylvania State Public School Building Authority, School Lease Revenue Bonds (The School District of Philadelphia Project), 5.25% due 6/01/2013 (f)(h) 6,426 6,250 Philadelphia, Pennsylvania, Authority for Industrial Development, Lease Revenue Bonds, Series B, 5.50% due 10/01/2021 (f) 6,632 ----------------------------------------------------------------------------------------------------------------------------------- South Carolina - 5.6% 3,750 Berkeley County, South Carolina, School District, Installment Lease Revenue Bonds (Securing Assets for Education Project), 5.125% due 12/01/2030 3,883 3,200 Kershaw County, South Carolina, Public Schools Foundation, Installment Power Revenue Refunding Bonds, 5% due 12/01/2029 (k) 3,298 8,800 Scago Educational Facilities Corporation for Pickens County School District, South Carolina, Revenue Bonds, 5% due 12/01/2031 (f) 9,111 8,900 South Carolina Transportation Infrastructure Bank Revenue Bonds, Series A, 5% due 10/01/2033 (a) 9,163 ----------------------------------------------------------------------------------------------------------------------------------- Tennessee - 4.0% 7,850 Chattanooga, Tennessee, IDB, Lease Rent Revenue Bonds (Southside Redevelopment Corporation), 5.875% due 10/01/2024 (a) 8,274 5,000 Memphis-Shelby County, Tennessee, Airport Authority, Airport Revenue Bonds, AMT, Series D, 6.25% due 3/01/2018 (a) 5,281 2,075 Tennessee HDA, Homeownership Revenue Bonds, AMT, Series 2-C, 6.10% due 7/01/2013 (a) 2,125 2,340 Tennessee HDA, Homeownership Revenue Bonds, AMT, Series 2-C, 6.20% due 7/01/2015 (a) 2,381 ----------------------------------------------------------------------------------------------------------------------------------- Texas - 12.3% 2,000 Austin, Texas, Convention Center Revenue Bonds (Convention Enterprises Inc.), Trust Certificates, Second Tier, Series B, 6% due 1/01/2011 (h) 2,135 1,000 Bell County, Texas, Health Facilities Development Revenue Bonds (Lutheran General Health Care System), 6.50% due 7/01/2019 (c) 1,181 1,835 Dallas-Fort Worth, Texas, International Airport Revenue Refunding and Improvement Bonds, AMT, Series A, 5.875% due 11/01/2017 (d) 1,943 2,145 Dallas-Fort Worth, Texas, International Airport Revenue Refunding and Improvement Bonds, AMT, Series A, 5.875% due 11/01/2018 (d) 2,271 2,385 Dallas-Fort Worth, Texas, International Airport Revenue Refunding and Improvement Bonds, AMT, Series A, 5.875% due 11/01/2019 (d) 2,526 2,600 Gregg County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Good Shepherd Medical Center Project), 6.375% due 10/01/2010 (h)(j) 2,816 BlackRock MuniYield Quality Fund, Inc. Schedule of Investments as of July 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Value ----------------------------------------------------------------------------------------------------------------------------------- $ 6,000 Gregg County, Texas, Health Facilities Development Corporation, Hospital Revenue Bonds (Good Shepherd Medical Center Project), 6.875% due 10/01/2010 (h)(j) $ 6,586 4,000 Harris County-Houston Sports Authority, Texas, Revenue Refunding Bonds, Senior Lien, Series G, 5.75% due 11/15/2020 (g) 4,247 9,250 Leander, Texas, Independent School District, Capital Appreciation, GO, Refunding (School Building), 5.46% due 8/15/2028 (d)(n) 3,090 13,350 Leander, Texas, Independent School District, Capital Appreciation, GO, Refunding (School Building), 5.58% due 8/15/2035 (n) 2,961 6,150 Lewisville, Texas, Independent School District, Capital Appreciation and School Building, GO, Refunding, 4.748% due 8/15/2024 (d)(n) 2,657 7,150 North Harris County, Texas, Regional Water Authority, Senior Lien Revenue Bonds, 5.125% due 12/15/2035 (g) 7,379 1,225 North Texas Thruway Authority, Dallas North Thruway System Revenue Bonds, Series A, 5% due 1/01/2035 (f) 1,259 2,098 Texas State Affordable Housing Corporation, S/F Mortgage Revenue Bonds (Professional Educators Home Loan Program), AMT, Series A-1, 5.50% due 12/01/2039 (o)(p) 2,202 7,200 Texas State Turnpike Authority, Central Texas Turnpike System Revenue Bonds, First Tier, Series A, 5.75% due 8/15/2038 (a) 7,702 4,600 Travis County, Texas, Health Facilities Development Corporation, Revenue Refunding Bonds (Ascension Health Credit), Series A, 6.25% due 11/15/2009 (g)(h) 4,889 ----------------------------------------------------------------------------------------------------------------------------------- Utah - 3.7% 15,000 Salt Lake City, Utah, Hospital Revenue Refunding Bonds (IHC Hospitals Inc.), 6.30% due 2/15/2015 (g) 16,881 ----------------------------------------------------------------------------------------------------------------------------------- Virginia - 0.7% 3,100 Halifax County, Virginia, IDA, Exempt Facility Revenue Refunding Bonds (Old Dominion Electric Cooperative Project), AMT, 5.625% due 6/01/2028 (a) 3,322 ----------------------------------------------------------------------------------------------------------------------------------- Washington - 2.7% 2,400 Port of Tacoma, Washington, Revenue Refunding Bonds, Series A, 5.25% due 12/01/2014 (a)(h) 2,604 5,100 Tacoma, Washington, Regional Water Supply System, Water Revenue Bonds, 5% due 12/01/2032 (g) 5,219 4,125 Washington State, GO, Series A and AT-6, 6.25% due 2/01/2011 (f) 4,307 ----------------------------------------------------------------------------------------------------------------------------------- Total Municipal Bonds (Cost - $590,313) - 134.7% 608,682 ----------------------------------------------------------------------------------------------------------------------------------- Municipal Bonds Held in Trust (r) ----------------------------------------------------------------------------------------------------------------------------------- California - 7.1% 5,700 California State, GO, Refunding, 5.25% due 2/01/2033 (j) 5,988 10,000 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series B, 5.50% due 6/01/2013 (b)(h) 10,817 14,160 Golden State Tobacco Securitization Corporation of California, Tobacco Settlement Revenue Bonds, Series B, 5.625% due 6/01/2013 (h)(k) 15,409 ----------------------------------------------------------------------------------------------------------------------------------- Georgia - 2.3% 10,000 Atlanta, Georgia, Airport Passenger Facility Charge, Subordinate Lien Revenue Refunding Bonds, Series C, 5% due 1/01/2033 (f) 10,270 ----------------------------------------------------------------------------------------------------------------------------------- Illinois - 9.4% 10,000 Chicago, Illinois, Board of Education, GO (Chicago School Reform Project), 5.75% due 12/01/2027 (a) 10,263 13,665 Chicago, Illinois, O'Hare International Airport, General Airport Revenue Refunding Bonds, Third Lien, AMT, Series A, 5.75% due 1/01/2021 (g) 14,409 5,000 Chicago, Illinois, O'Hare International Airport, General Airport Revenue Refunding Bonds, Third Lien, AMT, Series A, 5.50% due 1/01/2022 (g) 5,212 BlackRock MuniYield Quality Fund, Inc. Schedule of Investments as of July 31, 2007 (Unaudited) (in Thousands) Face State Amount Municipal Bonds Held in Trust (r) Value ----------------------------------------------------------------------------------------------------------------------------------- $12,500 Chicago, Illinois, O'Hare International Airport, General Airport Revenue Refunding Bonds, Third Lien, AMT, Series A, 5.375% due 1/01/2032 (g) $ 12,883 ----------------------------------------------------------------------------------------------------------------------------------- Massachusetts - 0.9% 3,825 Massachusetts State Port Authority, Special Facilities Revenue Bonds (Delta Air Lines Inc. Project), AMT, Series A, 5.50% due 1/01/2019 (a) 3,997 ----------------------------------------------------------------------------------------------------------------------------------- New Jersey - 3.1% 7,150 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.50% due 6/15/2024 (e) 7,572 6,000 New Jersey EDA, Cigarette Tax Revenue Bonds, 5.50% due 6/15/2031 (e) 6,461 ----------------------------------------------------------------------------------------------------------------------------------- New York - 3.3% 13,840 New York City, New York, GO, Series B, 5.875% due 8/01/2016 (g) 14,752 ----------------------------------------------------------------------------------------------------------------------------------- Oregon - 3.5% 15,000 Portland, Oregon, Sewer System Revenue Bonds, Series A, 5.75% due 8/01/2010 (d)(h) 15,825 ----------------------------------------------------------------------------------------------------------------------------------- Texas - 2.5% 10,470 Denton, Texas, Utility System Revenue Bonds, Series A, 6% due 12/01/2010 (f)(h) 11,177 ----------------------------------------------------------------------------------------------------------------------------------- Washington - 3.6% 15,000 Energy Northwest, Washington, Electric Revenue Refunding Bonds (Project Number 1), Series A, 5.75% due 7/01/2017 (g) 16,171 ----------------------------------------------------------------------------------------------------------------------------------- Total Municipal Bonds Held in Trust (Cost - $156,872) - 35.7% 161,206 ----------------------------------------------------------------------------------------------------------------------------------- Shares Held Short-Term Securities ----------------------------------------------------------------------------------------------------------------------------------- 2,700 Merrill Lynch Institutional Tax-Exempt Fund, 3.47% (l)(q) 2,700 ----------------------------------------------------------------------------------------------------------------------------------- Total Short-Term Securities (Cost - $2,700) - 0.6% 2,700 ----------------------------------------------------------------------------------------------------------------------------------- Total Investments (Cost - $749,885*) - 171.0% 772,588 Other Assets Less Liabilities - 1.4% 6,362 Liabilities for Trust Certificates, Including Interest Expense Payable - (17.0%) (76,747) Preferred Stock, at Redemption Value - (55.4%) (250,241) ---------- Net Assets Applicable to Common Stock - 100.0% $ 451,962 ========== * The cost and unrealized appreciation (depreciation) of investments as of July 31, 2007, as computed for federal income tax purposes, were as follows: Aggregate cost $ 674,452 ========= Gross unrealized appreciation $ 23,983 Gross unrealized depreciation (2,002) --------- Net unrealized appreciation $ 21,981 ========= (a) AMBAC Insured. (b) XL Capital Insured. (c) Escrowed to maturity. (d) FGIC Insured. (e) Assured Guaranty Insured. (f) FSA Insured. (g) MBIA Insured. (h) Prerefunded. BlackRock MuniYield Quality Fund, Inc. Schedule of Investments as of July 31, 2007 (Unaudited) (in Thousands) (i) The rate disclosed is that currently in effect. This rate changes periodically and inversely based upon prevailing market rates. (j) Radian Insured. (k) CIFG Insured. (l) Investments in companies considered to be an affiliate of the Fund, for purposes of Section 2(a)(3) of the Investment Company Act of 1940, were as follows: -------------------------------------------------------------------------- Net Dividend Affiliate Activity Income -------------------------------------------------------------------------- Merrill Lynch Institutional Tax-Exempt Fund (4,016) $123 -------------------------------------------------------------------------- (m) These securities are short-term floating rate certificates issued by tender option bond trusts and are secured by the underlying municipal bond securities. (n) Represents a zero coupon or step bond; the interest rate shown reflects the effective yield at the time of purchase. (o) FNMA/GNMA Collateralized. (p) FHLMC Collateralized. (q) Represents the current yield as of July 31, 2007. (r) Securities represent underlying bonds transferred to a separate securitization trust established in a tender option bond transaction in which the Fund may have acquired the residual interest certificates. These securities serve as collateral in a financing transaction. o Forward interest rate swaps outstanding as of July 31, 2007 were as follows: ---------------------------------------------------------------------------------------- Notional Unrealized Amount Appreciation ---------------------------------------------------------------------------------------- Pay a fixed rate of 3.697% and receive a floating rate based on 1-Week Bond Market Association Rate Broker, JPMorgan Chase Expires August 2017 $ 20,000 $ 307 ---------------------------------------------------------------------------------------- Item 2 - Controls and Procedures 2(a) - The registrant's principal executive and principal financial officers or persons performing similar functions have concluded that the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the "1940 Act")) are effective as of a date within 90 days of the filing of this report based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act and Rule 13a-15(b) under the Securities and Exchange Act of 1934, as amended. 2(b) - There were no changes in the registrant's internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act (17 CFR 270.30a-3(d)) that occurred during the registrant's last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. Item 3 - Exhibits Certifications - Attached hereto Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. BlackRock MuniYield Quality Fund, Inc. By: /s/ Robert C. Doll, Jr. ----------------------------------- Robert C. Doll, Jr., Chief Executive Officer (principal executive officer) of BlackRock MuniYield Quality Fund, Inc. Date: September 20, 2007 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By: /s/ Robert C. Doll, Jr. ----------------------------------- Robert C. Doll, Jr., Chief Executive Officer (principal executive officer) of BlackRock MuniYield Quality Fund, Inc. Date: September 20, 2007 By: /s/ Donald C. Burke ----------------------------------- Donald C. Burke, Chief Financial Officer (principal financial officer) of BlackRock MuniYield Quality Fund, Inc. Date: September 20, 2007