Concerts

Orchestras

NATIONAL PHILHARMONIC High School Summer String Institute, Friday at 7:30, conducted by Piotr Gajewski in Mozart's Divertimento, Bach's Concerto No. 2, Elgar's "Serenade" and Foote's "Suite." Free. Landon School, 6101 Wilson Lane, Bethesda. 301-762-8580.

ARMY BAND and ensembles, Friday at 8. Free. West Terrace, U.S. Capitol. 703-696-3399 or 202- 619-7222.

NAVY BAND and ensembles, Monday at 8. Free. West Terrace, U.S. Capitol. 202-433-2525 or 202- 619-7222.

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 and Thursday 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.

Chamber Groups

MOUNT VERNON ORCHESTRA Woodwind Quintet, Sunday at 3. Free. The Lyceum, 201 S. Washington St., Alexandria. 703-838-4994.

NATIONAL PHILHARMONIC String Quartet, Thursday at 8. F. Scott Fitzgerald Theatre, 603 Edmonston Dr., Rockville. 301-762-8580.

Recitals

EDWARD NASSOR -- carillonneur, Saturday at 6. Free. Netherlands Carillon, Fort Myer and Marshall drives, Arlington. 703-289-2500.

MATTHEW MIDDLETON -- organist, Sunday at 6. Free. National Shrine Of The Immaculate Conception, 400 Michigan Ave. NE. 202-526-8300.

RACHEL BARHAM -- soprano, and pianist Deke Polifka, Tuesday at 12:10. Free. Church of the Epiphany, 1317 G St. NW. 202-347-2635.

JORGE ESPINOZA -- cellist, Thursday at 6:30. Free. Andres Bello Auditorium, 1300 New York Ave. NW. 202-623-3929.

Choral Groups

HARMONY HERITAGE SINGERS -- Wednesday at 7:30. Free. Lee District Park, 6601 Telegraph Rd., Franconia. Free. 703-922-9841 or 703-324-8680.