National Symphony Orchestra    - Based at the John F. Kennedy Center for the Performing Arts. Online ticketing.

Alexandria Symphony Orchestra - Fully professional ensemble based at Alexandria's Rachel M. Schlesinger Concert Hall and Arts Center. Online ticketing.

American Balalaika Symphony - Performs symphonic and folk music on the balalaika and domra, traditional Russian plucked-string instruments, combining the best of Russian and American traditions.

Arlington Symphony - Offering classical, pops and family programs in concert at the Schlesinger Concert Hall and Arts Center.

Bach Sinfonia - Period-instrument chamber orchestra provides concerts, lectures and discussions to enhance understanding of the variety of styles, composers and masterpieces of the Baroque, pre-Classical, and Classical eras.

Eclipse Chamber Orchestra - Twenty-one members of the National Symphony Orchestra with a mission to make high-quality concert performances accessible to listeners of every economic level.

Fairfax Symphony Orchestra - Offers an annual concert series at the George Mason University Center for the Arts, as well as an extensive series of outreach programs in area schools. Online ticketing.

McLean Orchestra - Eighty-member ensemble offering varied repertoire and committed to community outreach. Includes information on season schedule, sponsorship, artists and youth orchestra. Online ticketing.

National Philharmonic - Offers an orchestral concert series and hosts guest artists in its chamber and piano series, and performs with the National Philharmonic Chorale. Formerly the National Chamber Orchestra.

Post-Classical Ensemble - Performs fine music in the context of its cultural heritage, including folk song, dance, film and contemporary popular music. Includes schedule, profile, director biographies, contact and subscription information.

Trinity Chamber Orchestra - Performs at the historic Trinity Theater in Georgetown. Tickets, schedule, directions and contact info.

Virginia Chamber Orchestra - Forty-member group performing in communities throughout the Washington metropolitan area and Virginia.

Washington Balalaika Society - Traditional Russian folk orchestra and ensembles, with programs for musicians at all levels, from beginner to professional.

Washington Symphony Orchestra - Committed to bringing symphonic performances to Washington-area schoolchildren and to promoting music education. Online ticketing.

American Chamber Players - Six-member group that performs a varied repertoire ranging from familiar masterpieces to neglected gems to newly commissioned American works. Includes sound demos.

ArcoVoce - Performers on both modern and period instruments and voice juxtapose historically informed performances of early music with explorations of modern and standard repertory.

Arioso - Flute, oboe and bassoon ensemble performs classical, Baroque and modern music either as a trio or an oboe-bassoon duo. Available for weddings and events. Includes performance schedule, press kit and sound demos.

Armonia Nova - Ensemble of instruments and voices that performs medieval and Renaissance music of Europe on historically accurate instruments. Includes schedule, member biographies, sound samples and photos.

Capitol Woodwind Quintet - Includes schedule for concert series at Temple Micah, history, artists, CD information and reviews.

Columbia Flute Choir - Presents a variety of classical music, as well as original works for flute choir, and hosts an annual festival. Includes schedule, photos, press, video, recordings and contact info.

Contemporary Music Forum - "Washington's oldest new music ensemble" presents unique programs featuring new works of chamber music, often by local composers.

Duo Con Brio - Flute and guitar duo concertizes and is available for hire in the Washington area. Includes bio, contact info and sound demos.

Eastwind Consort - Flute, clarinet and bassoon trio. Profile, reviews, repertoire, performance schedule, sound sample, guestbook and contact info.

EcoVoce - Ensemble specializing in music with nature themes and dedicated to raising ecological awareness. Profiles, booking info and sound samples.

Endymion Ensemble - Specializes in repertoire ranging from Baroque to contemporary that because of its unusual size or instrumentation is seldom performed. Includes upcoming concerts, personnel, mailing list and links.

Ensemble Gaudior - Historic-performance group dedicated to presenting masterpieces of chamber music from the Baroque and Classical eras.

Fessenden Ensemble - Performs concert series at St. Columba's Episcopal Church, Tenleytown.

Flutar - Flute and guitar duo performs classical world music that blends ethnic, folk, jazz, classical and contemporary styles.

Folger Consort - Masters of the lute, viol and other early-music instruments perform repertoire from the 12th through 18th centuries, often joined by guest instrumentalists and singers. Based at the Folger Shakespeare Library. Online ticketing.

Hesperus - Eclectic early-music group whose repertoire spans the European medieval, Renaissance and Baroque periods, often fused with Appalachian, gospel, blues, Cajun and Irish styles. Includes CD offerings and sound demos.

Left Bank Concert Society - Celebrates the essential beauty of great chamber music with an emphasis on significant new works. Includes group profile, roster, ticket information and schedule of performances at the Kennedy Center's Terrace Theater.

Lyra Chamber Ensemble - Professional group that celebrates the diversity of music, with an emphasis on works by minority, women, gay and lesbian composers.

Mendelssohn Piano Trio - Artists in residence for the Embassy Series. News, profile, members, concert schedule, repertoire, reviews and booking information.

Monumental Brass Quintet - Artists in residence at the Levine School of Music, with a repertoire that includes all styles of classical music, as well as dixieland jazz, ragtime, movie music, show tunes and big band favorites.

Potomac Guitar Trio - Includes repertoire, composer links, MP3s and contact information.

Potomack Flutes - Profiles, events, guestbook and links for quartet of flutists.

Prism Brass Quintet - Calendar, biographies, services, recordings, sound samples, program notes, repertoire, mailing list and contact information.

Southwest Chamber Players - Concert series at St. Augustine's Episcopal Church in Southwest. Includes upcoming programs, past concerts and mailing list.

Strata - Trio including Nathan Williams, clarinet; James Stern, viola/violin; and Audrey Andrist, piano. Offers profile, performances, reviews, sound samples and contact information.

Teri Lazar and Osman Kivrak - Violinist and violist who perform together and as part of the Sunrise Quartet. Schedule, profiles, reviews, sound samples, links, recordings and guestbook.

Violins of Lafayette - Period-instrument ensemble dedicated to the music of the 17th and 18th centuries, with an emphasis on operatic works.

Washington Musica Viva - Founded to provide intimate, informal performances of classical and contemporary chamber music, often in conjunction with literary and visual presentations. Produces series devoted to Czech music and to Jewish composers.

Washington Symphonic Brass - Specializing in works for large brass ensemble and percussion, repertoire ranges from Renaissance to contemporary and from ceremonial to popular music. Includes sound demos.

Friday Morning Music Club - Volunteer symphony orchestra composed of professional and amateur players, offering four to five free concerts annually.

Georgetown Symphony Orchestra - Volunteer ensemble offering classic symphonic repertoire and exploring the best of 20th-century music. Programming regularly includes family concerts and educational and historical performances.

JCC Symphony Orchestra - Sponsored by the Jewish Community Center of Greater Washington. Provides a short history of the orchestra, a sketch of its music director, current and past programs, ticket info, personnel rosters and links.

McLean Symphony - Group of 65 musicians drawn from the community, offering a variety of programming throughout the year, including family concerts and small-ensemble recitals.

NIH Community Orchestra - Affiliated with the National Institutes of Health, and performing repertoire spanning five centuries, from music of the Renaissance through 20th-century works.

Pan American Symphony Orchestra - Community-based orchestra founded to present new and rarely performed Latin American music to the public.

Washington Metropolitan Philharmonic - Season schedule, director profile, roster, audition information, sound samples, reviews and online ticketing. Information on the Youth Orchestra, summer series and concerto competition. Formerly the Mount Vernon Orchestra.

Washington Pro Musica - Tax-exempt organization whose purpose is to foster the appreciation of classical music. Sponsors chamber and youth orchestras and a swing band.

American Youth Philharmonic Orchestras - Comprising four orchestras offering performing and touring opportunities for musicians up to 21 years of age. Based in Northern Virginia.

D.C. Youth Orchestra - Center for classical instrumental music instruction and performance opportunities for young people ages 4-19 throughout the metropolitan area.

Flutopia and Premiere Winds - Northern Virginia based woodwind ensembles open to middle school, high school and college musicians.

Maryland Classic Youth Orchestras - Serving the Washington metropolitan area, providing continuing instruction in orchestral literature to young musicians grades 4-12.

McLean Youth Orchestra - Under the auspices of the McLean Orchestra, this program offers young musicians ages 12-18 the opportunity to play in an accomplished orchestra and with its professional guest artists.

Washington Metropolitan Youth Orchestra - Schedule and audition information. Sponsored by the Washington Metropolitan Philharmonic.

Youth Orchestras of Prince William - Enrolls approximately 300 students in three string orchestras, two symphony orchestras and a variety of chamber music ensembles.

Beethoven Society of America (BSOA) - An educational and cultural organization offering opportunities to attend embassy concerts, receptions and other musical events at a readily affordable price. Includes concert schedule, special events and information on reservations and membership.

Early Music DC (EMDC) - Guide to concerts, organizations, ensembles, soloists and extensive early music links.

Flute Society of Washington - Information on regional flute events, competitions and membership, flutist guestbook, classifieds and flute links.

Gamelan Mitra Kusuma - Traditional Balinese gamelan orchestra and dance troupe performs throughout the Washington area and offers instruction in gamelan instruments. Includes performance schedule, mailing list, links and audio samples.

Indian Classical Music - Washington DC - Concert listings and information about classical Indian music.

Kindler Cello Society of Washington - Non-profit organization for cellists of all ages and abilities. Includes cello news and events, classifieds, membership info and links.

Korean Concert Society - Non-profit organization dedicated to providing opportunities for young Korean-American artists and to presenting quality musical performances to Washington-area audiences.

NSOvation: Young Patrons of the NSO - Founded in 1991, the mission of NSOvation is to cultivate a new generation of symphony patrons.

SingerSource - A network and job exchange for singers, music directors and those who seek their services. Includes information on contracting singers, listings for local music professionals and arts links.

Urban Philharmonic Society - Non-profit organization committed to bringing classical music opportunities to minorities and their communities. Sponsors ensembles, concerts and the Paul Robeson Vocal Competition.

Vocal Arts Society of Washington - Presents world-class vocal artists, including many notable local debuts, in recital at the Kennedy Center's Terrace Theater, and works to promote greater interest in the art of song.

Washington Guitar Society (WGS) - News, events calendar, MP3s, newsletter articles, membership information and classical guitar links.

Washington International Piano Arts Council (WIPAC) - Sponsors an international amateur piano competition and recitals at various Washington venues. Includes calendar of events, competition details, history, membership form, photos and contact info.

Washington Recorder Society - Meets for ensemble playing, instruction and guest artist concerts. Includes schedule, classifieds and recorder links.

Washington Toho Koto Society - Non-profit group of musicians and friends founded to promote the understanding and appreciation of Japanese koto music.