WOLF TRAP OPERA COMPANY and the National Symphony Orchestra -- Puccini's "La Boheme," Friday at 8:15. Filene Center, Wolf Trap Park, 1551 Trap Rd., Vienna. 703-218-6500 or 703-255-1860.
OPERA INTERNATIONAL -- Poulenc's "Dialogues of the Carmelites," Friday at 7:30 and Sunday at 4. Lisner Auditorium, 730 21st St. NW. 202-397-7328 or 301-365-3479.
WOLF TRAP OPERA COMPANY -- Donizetti's "L'elisir d'amore," Saturday at 8. The Barns of Wolf Trap, 1635 Trap Rd., Vienna. 703-218-6500 or 703-255-1860.
ANNAPOLIS OPERA COMPANY -- Thursday at noon. Free. Mount Vernon Place, 600 N. Charles St., Baltimore. 410-244-1030.
D.C. YOUTH ORCHESTRA -- Friday at 7. Free. Coolidge High School, Fifth and Sheridan NW. 202-723-1612.
NVCC-ANNANDALE ORCHESTRA -- Friday at 7:30, with vocalist Ericka Ovette. Free. Lake Accotink Park, 7500 Accotink Park Rd., Springfield. 703-569-3464 or 703-425-9300.
ARMY BAND and ensembles, Friday at 8. Free. West Terrace, U.S. Capitol. 703-696-3399 or 202- 619-7222.
FAIRFAX SYMPHONY ORCHESTRA -- Friday and Saturday at 8. Shenandoah Valley Music Festival, Shrine Mont Retreat and Conference Center, Orkney Springs, Va. 800-459-3396 or 540-459-3396.
ARAB-ISRAELI ORCHESTRA of Nazareth, Saturday at 8:30, with vocalist Lubna Lalameh. Gaston Hall, Georgetown University, 37th and O NW. 202-687-3838.
NATIONAL CONCERT 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.
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.
ARMY BAND -- Wednesday at 7:30. Free. Mason District Park, Newton W. Edwards Amphitheater, 6621 Columbia Pike, Annandale. 703-941-1730 or 703-324-8680.
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.
NATIONAL SYMPHONY ORCHESTRA -- Thursday at 8:15, conducted by Paul Haas with violinist Itzhak Perlman in Wagner's Overture to "Tannhauser," Bruch's Violin Concerto No. 1 and Tchaikovsky's Symphony No. 4. Filene Center, Wolf Trap Park, 1551 Trap Rd., Vienna. 703-218-6500 or 703-255-1860.
MOUNT VERNON ORCHESTRA ensembles, Sunday at 3. Free. The Lyceum, 201 S. Washington St., Alexandria. 703-799-8229 or 703-838-4994.
JEFFREY COHAN -- flutist, and harpsichordist George Shangrow. Saturday at 8: St. Mark's Church, Third and A streets SE. Monday at 8: St. Anne's Episcopal Church, 199 Duke of Gloucester St., Annapolis. 800-281-8026.
WENDY GLAUBITZ -- soprano, harpsichordist Vera Kochanowsky and others, Sunday at 4. Free. Lutheran Church of the Reformation, 212 East Capitol St. NE. 202-543-4200 or 703-527-9319.
"MUSIC OF CONRAD BERNIER" -- Sunday at 6, performed by his students to commemorate the centenary of his birth. Free. National Shrine Of The Immaculate Conception, 400 Michigan Ave. NE. 202-526-8300.
SUMI GUITAR DUO -- Tuesday at 12:10. Free. Church of the Epiphany, 1317 G St. NW. 202-347-2635.
TAKEAKI MIYAMAE -- flutist, Wednesday at 7. Free, but donations of canned food encouraged for United Community Ministries Food Pantry. Mount Vernon High School, 8515 Old Mount Vernon Rd., Alexandria. 703-780-9294.
NATHAN FISCHER AND DENIS Azabagic, guitarists, Wednesday at 8. The Athenaeum, 201 Prince St., Alexandria. 703-548-0035.
JEFFREY COHAN -- flutist, violinist Risa Browder, violist Stephen Creswell and cellist John Moran. Tuesday at 8: St. Mark's Church, Third and A streets SE. Wednesday at 8: St. Anne's Episcopal Church, 199 Duke of Gloucester St., Annapolis. 800-281-8026.
REILLY LEWIS -- harpsichordist, flutist Jeffrey Cohan, violinists Risa Browder and Leslie Nero, violist Stephen Creswell and cellist John Moran, Thursday at 8. St. Mark's Church, Third and A streets SE. 800-281-8026.
ELLIOT FRANK AND JAMES Piorkowski, guitarists, Thursday at 8. The Athenaeum, 201 Prince St., Alexandria. 703-548-0035.