SUMMER OPERA THEATRE Company -- Mozart's "The Impresario" and Puccini's "Suor Angelica," Friday at 8 and Sunday at 2. Hartke Theatre, Catholic University, 620 Michigan Ave. NE. 202-319-4000 or 202-526-1669.
CHESAPEAKE ORCHESTRA -- Friday at 7, conducted by Jeffrey Silberschlag with violinist Lara St. John in Bach's Toccata and Fugue in D Minor, Bruch's Violin Concerto No. 1 and Mahler's Symphony No. 5. Free. St. Mary's College of Maryland, Route 5, St. Mary's City. 240-895-2024.
BALTIMORE SYMPHONY ORCHESTRA -- Friday at 7, conducted by Juanjo Mena with horn players Philip Munds and Peter Landgren in "A Night in Italy." Wednesday at 7, conducted by Juanjo Mena with guitarist Manuel Barrueco and dancer Anna Menendez in music of Spain. Joseph Meyerhoff Symphony Hall, 1212 Cathedral St., Baltimore. 410-783-8000 or 800-442-1198.
D.C. YOUTH ORCHESTRA -- Friday at 7. Free. Coolidge High School, Fifth and Sheridan NW. 202-723-1612.
NATIONAL SYMPHONY ORCHESTRA -- Friday at 7:30, conducted by Joan Landry in music by Leonard Bernstein, Mozart, Still, Saint-Saens and Dvorak. Saturday at 7:30, conducted by Emil de Cou in movie themes by John Williams, excerpts from Aaron Copland's "Billy the Kid" and "Rodeo," and light classics by other American composers. Free. Carter Barron Amphitheatre, 4850 Colorado Ave. NW. 202-426-0486 or 202-254-2468.
FAIRFAX SYMPHONY SUMMER Band, Friday at 7:30. Free. Lake Accotink Park, 7500 Accotink Park Rd., Springfield. 301-569-3464 or 703-425-9300.
ARMY BAND and ensembles, Friday at 8. Free. West Terrace, U.S. Capitol. 703-696-3399 or 202- 619-7222.
KENNEDY CENTER OPERA House Orchestra, Saturday at 6, in works by Bliss and Shostakovich. Free. Millennium Stage, Kennedy Center Grand Foyer, 2700 F St. NW. 202-467-4600 or 800-444-1324 (TDD: 202-416-8524).
MARINE BAND -- Saturday at 7:30, conducted by Col. Timothy W. Foley and Maj. Michael J. Colburn with guest conductor John R. Bourgeois in music by Sousa, Gershwin, Bernstein, Grainger and others. Free, but tickets required. Schlesinger Arts Center, Northern Virginia Community College, 3001 N. Beauregard St., Alexandria. 202-433-4011.
BALTIMORE SYMPHONY ORCHESTRA -- Saturday at 8, conducted by Andrew Constantine in an evening of movie themes, followed by fireworks. Oregon Ridge Park, 13401 Beaver Dam Rd., Cockeysville. 410-783-8000.
NATIONAL CONCERT BAND -- Saturday at 8. Free. Lubber Run Amphitheater, North Columbus and North Second streets, Arlington. 703-228-1850 or 703-228-6966.
NSO SUMMER MUSIC Institute Orchestra, Sunday, Monday and Tuesday at 6. Free. Millennium Stage, Kennedy Center Grand Foyer, 2700 F St. NW. 202-467-4600 or 800-444-1324 (TDD: 202-416-8524).
FAIRFAX SYMPHONY SUMMER Band, Sunday at 7:30. Free. Mason District Park, Newton W. Edwards Amphitheater, 6621 Columbia Pike, Annandale. 703-941-1730 or 703-324-8680.
NAVY BAND and ensembles, Monday and Thursday at 8. Free. West Terrace, U.S. Capitol. 202-433-2525 or 202- 619-7222.
NAVAL ACADEMY BAND ensembles, Tuesday at 7:30. Free. City Dock, Annapolis. 410-293-1262.
ARMY BAND -- Tuesday at 7:30. Free. Market Square, 301 King St., Alexandria. 703-883-4686 or 03-696-3399.
AIR FORCE BAND and ensembles, Tuesday at 8. Free. West Terrace, U.S. Capitol. 202-767-5658 or 202- 619-7222.
NAVY BAND and ensembles, Tuesday at 8. Free. U.S. Navy Memorial, 701 Pennsylvania Ave. NW. 202-737-2300 or 202-433-2525.
AIR FORCE BAND and ensembles, Wednesday at noon. Free. National Air and Space Museum, Seventh and Independence SW. 202-767-5658 or 202-357-2700.
MARINE BAND and ensembles, Wednesday at 8. Free. West Terrace, U.S. Capitol. 202-433-4011 or 202- 619-7222.
MARINE BAND and ensembles, Thursday at 7. Free. U.S. Marine Corps War Memorial (Iwo Jima Memorial), on U.S. 50 next to Arlington National Cemetery. 202-433-4011.
AMERICAN BALALAIKA SYMPHONY -- Thursday at 7:30, conducted by Peter Trofimenko in Khachaturian's "Masquerade" Suite, Shostakovich's Waltz No. 2 and Verdi's Prelude to "La Traviata." Free. Strathmore Hall Arts Center, 10701 Rockville Pike, North Bethesda. 301-530-0540.
CITY OF FAIRFAX BAND -- Thursday at 8. Free. Veterans Amphitheater, Fairfax City Hall, 10455 Armstrong St., Fairfax. 703-385-7858 or 703-757-0220.
NATIONAL SYMPHONY ORCHESTRA -- Thursday at 8:15, conducted by Patrick Summers with soprano Renee Fleming in music by Mozart, Massenet, Korngold, Strauss, Puccini, Catalani, Porter and Holmes. Filene Center, Wolf Trap Park, 1551 Trap Rd., Vienna. 703-218-6500 or 703-255-1860.
WILLIAM MONTGOMERY Master Class Flute Choir, Friday at noon. Free. Arts Club of Washington, 2017 I St. NW. 202-331-7282.
SILVERWINDS FLUTE ENSEMBLE -- Friday at 6:30. Free. Brookside Gardens, 1800 Glenallan Ave., Wheaton. 301-962-1400.
CON BRIO! -- Friday at 8. Grace Church, 1041 Wisconsin Ave. NW. 202-333-7100.
FAIRFAX SYMPHONY ORCHESTRA ensembles, Saturday at 1. Sully Historic Site, 3601 Sully Rd., Chantilly. 703-642-7200 or 703-437-1794.
WASHINGTON NATIONAL OPERA Institute for Young Singers participants, Saturday at noon. Free. Ward Recital Hall, Catholic University, 620 Michigan Ave. NE. 202-48-3465.
EDWARD NASSOR -- carillonneur, Saturday at 6. Free. Netherlands Carillon, Fort Myer and Marshall drives, Arlington. 703-289-2500.
SERGEI PODOBEDOV -- pianist, Saturday at 7:30. Warrenton Presbyterian Church, 91 Main St., Warrenton. 540-788-3356.
MARCOLIVIA -- violin/viola duo, Sunday at 3. Free. The Lyceum, 201 S. Washington St., Alexandria. 703-838-4994.
ARTHUR LAMIRANDE -- organist, Sunday at 6. Free. National Shrine Of The Immaculate Conception, 400 Michigan Ave. NE. 202-526-8300.
JARROD SMERK -- guitarist, Tuesday at 12:15. Free. St. Paul's Parish, Charles and Saratoga streets, Baltimore. 410-685-5537.
WASHINGTON NATIONAL Opera Institute for Young Singers participants, Wednesday at 6. Free. Millennium Stage, Kennedy Center Grand Foyer, 2700 F St. NW. 202-467-4600 or 800-444-1324 (TDD: 202-416-8524).
EASTERN MUSIC FESTIVAL Piano Program musicians, Thursday at 6. Free. Millennium Stage, Kennedy Center Grand Foyer, 2700 F St. NW. 202-467-4600 or 800-444-1324 (TDD: 202-416-8524).
LONDON GAY MEN'S CHORUS -- Friday at 6. Free. Millennium Stage, Kennedy Center Grand Foyer, 2700 F St. NW. 202-467-4600 or 800-444-1324 (TDD: 202-416-8524).
ZION BAPTIST CHURCH Senior Choir, Saturday at 4. Zion Baptist Church, 4850 Blagden Ave. NW. 202-723-4152.
U. OF MARYLAND SUMMER Chorus, Saturday at 8, Faure's "Requiem" and Whitacre's "Cloudburst." Free. Dekelboum Concert Hall, Clarice Smith Performing Arts Center, University of Maryland, Route 193 and Stadium Drive, College Park. 301-405-2787.
ALEXANDRIA HARMONIZERS -- Thursday at 7:30. Free. Fort Ward Park, 4301 W. Braddock Rd., Alexandria. 703-883-4686.