WASHINGTON NATIONAL OPERA -- Verdi's "I vespri siciliani," Saturday at 7 and Tuesday at 7:30. "Trilogy: Domingo and Guests in Three Acts," through Oct. 9: Friday and Thursday at 7:30, Sunday at 2. Kennedy Center Opera House, 2700 F St. NW. 202-295-2400, 202-467-4600 or 800-444-1324.
BEL CANTANTI -- Donizetti's "La Fille du Regiment," Sunday at 7:30. The Lyceum, 201 S. Washington St., Alexandria. 703-838-4994.
NATIONAL GALLERY ORCHESTRA -- Sunday at 6, conducted by Christopher Kendall with violinist Nicolas Kendall, in works by Mahler, Schoenfield and Stravinsky. Free. West Garden Court, National Gallery of Art, Sixth and Constitution NW. 202-842-6941.
NATIONAL SYMPHONY ORCHESTRA -- Friday-Saturday at 8, conducted by Leonard Slatkin with cellist Truls Mork in Hovhaness' Symphony No. 2, Elgar's Cello Concerto in E minor and Dvorak's Symphony No. 6 in D major. Thursday at 7, conducted by Leonard Slatkin with violinist Nikolaj Znaider in Brahms's Tragic Overture in D minor, Bruch's Violin Concerto No. 1 in G minor and Corigliano's Symphony No. 1. Kennedy Center Concert Hall, 2700 F St. NW. 202-467-4600 or 800-444-1324 (TDD: 202-416-8524).
UM SYMPHONY ORCHESTRA -- Friday at 8, conducted by James Ross with violinist James Stern, in works by Beethoven, Strauss and Berg. Dekelboum Concert Hall, Clarice Smith Performing Arts Center, University of Maryland, Route 193 and Stadium Drive, College Park. 301-405-2787.
NAVY BAND -- Saturday at 8. Free. College of Southern Maryland, Fine Arts Center, 8730 Mitchell Rd., La Plata. 202-433-2525.
GUANGZHOU SYMPHONY ORCHESTRA -- Sunday at 8, conducted by Long Yu with pianist Lang Lang in Yin Chengzong's Yellow River Concerto, Ye Xiaogang's Suite on Cantonese Music and Chen Qigang's "Iris devoilee." Kennedy Center Concert Hall, 2700 F St. NW. 202-467-4600 or 800-444-1324 (TDD: 202-416-8524).
BALTIMORE SYMPHONY ORCHESTRA -- Friday-Saturday at 8, Sunday at 3, conducted by Juanjo Mena with flutist Emily Skala, in R. Strauss's "Metamorphosen," Beethoven's Symphony No. 7 and Rodrigo/Galway's "Fantasia para un Gentilhombre." Joseph Meyerhoff Symphony Hall, 1212 Cathedral St., Baltimore. 410-783-8000 or 800-442-1198.
AIR FORCE CHAMBER ORCHESTRA -- Sunday at 3. Free. Gaston Hall, Georgetown University, 37th and O streets NW. 202-767-5658.
NAVY BAND ENSEMBLES -- Sunday at 2. Free. Glenview Manion, Rockville Civic Center Park, 603 Edmonston Dr., Rockville. 240-314-5006.
100 PIANOS -- Monday-Tuesday at 6. Free. Millenium Stage, Kennedy Center's Terrace Theater, 2700 F St. NW. 202-467-4600 or 800-444-1324 (TDD: 202-416-8524).
TAKACS QUARTET & GARRICK OHLSSON -- Sunday at 7:30. Shriver Hall, Johns Hopkins University's Homewood Campus, 3400 N. Charles St., Baltimore. 410-516-7164.
ARMY FIELD BAND CHAMBER ENSEMBLES -- Sunday at 7. Oakland Historic Mansion, 5430 Vantage Point Rd., Columbia. 301-677-6586.
CAPITOL WOODWIND QUINTET -- Sunday at 5. Temple Micah, 2829 Wisconsin Ave. NW. 703-352-6505.
DAEDALUS QUARTET -- Friday at 8. Free, but tickets required. Coolidge Auditorium, Library of Congress, First and Independence SE. 202-397-7328 for tickets (service charges); 202-707-5502 for information.
UM SYMPHONIC WIND ENSEMBLE -- Sunday at 3. Free. Dekelboum Concert Hall, Clarice Smith Performing Arts Center, University of Maryland, Route 193 and Stadium Drive, College Park. 301-405-2787.
BALTIMORE SYMPHONY ORCHESTRA Chamber Ensembles, Saturday at 11. The Music Center at Strathmore, 5301 Tuckerman Lane, North Bethesda. 877-276-1444 or 301-581-5100.
ERIK SUTER -- organist, Sunday at 3. National Presbyterian Church, 4001 Nebraska Ave. NW. 202-537-7553.
IGNAT SOLZHENITSYN -- pianist, Sunday at 4. Part of the Foundation for Advanced Education in the Sciences Chamber Music Series. Landon School's Mondzac Performing Arts Center, 6101 Wilson Lane, Bethesda. 301-496-7976.
AMIT PELED -- cellist and pianist Li-Ly Chang, Saturday at 8. Latvian Lutheran Church, 400 Hurley Ave., Rockville. 301-933-3715.
THE KARKOWSKA SISTERS DUO -- Sunday at 3. Fairfax High School Auditorium, 3500 Old Lee Hwy., Fairfax. 703-273-2547.
CATHLEEN JEFFCOAT, ANN DAVIS, ROBERT ZUBER, Aaron Reeder and Judy Moore, Sunday at 4. Riverdale Presbyterian Church, 6513 Queens Chapel Rd., University Park. 301-927-0477.
KELLY KER-HACKLEMAN -- pianist, Wednesday at 8. Center for the Arts Concert Hall, George Mason University, 4400 University Dr., Fairfax. 703-218-6500 or 703-993-8888.
WASHINGTON KANTOREI -- Saturday at 8, with the Washington Cornett & Sackbutt Ensemble, part of the Daniel Pearl Music Days. German Embassy Auditorium, 4645 Reservoir Rd. NW. 703-527-9319.
CHANTICLEER -- Sunday at 7. Center for the Arts Concert Hall, George Mason University, 4400 University Dr., Fairfax. 703-218-6500 or 703-993-8888.
WASHINGTON BACH CONSORT -- Tuesday at 12:10. Free. Church of the Epiphany, 1317 G St. NW. 202-347-2635.
CATHEDRAL SINGS! -- Tuesday at 7:30. Washington National Cathedral, Wisconsin and Massachusetts avenues NW. 202-537-6200.
BALTIMORE OPERA COMPANY ENSEMBLES -- Thursday at noon. Free. West Park, W. Mount Vernon Pl., Baltimore. 410-244-1030.