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• (AU) Orchestras of Australia Network (TOAN) - Provides leadership, service, and support to orchestras in Australia, and aims to create an environment in which orchestras flourish artistically and financially.
• (AU) Orpheus Strings - Performing group of around 20 string players located in the Blue Mountains region of New South Wales.

• O'Riley, Christopher - Classical pianist who has taken the groundbreaking music of Radiohead and re-imagined it for solo piano.
• Oahu Choral Society - Performance group of experienced and non-professional singers. Also sponsors the annual Hawaii International Choral Festival in Honolulu.
• Oakland East Bay Symphony - Performs live professional symphonic and collaborative artistic orchestral performances to diverse audiences in Oakland and Bay Area communities.
• Oakland Youth Orchestra
• Obraztsova, Elena - Provides biography, pictures, discography, sound clips, and more for the Russian soprano.
• Obrecht, Jacob (c. 1458-1505) (1)
• Ockeghem, Johannes (c. 1410 - 1497) - Provides description of life and works.
• Octave Vocal Ensemble - Suffolk-based a cappella group performing 16th-21st century serious and light music.
• Odeum Guitar Duo, The - Specialising in performing new transcriptions of works by classical composers.
• Offenbach, Jacques (1819-1880) (2)
• Ogawa, Noriko - Provides biography, discography, schedule and announcements for the classical pianist.
• Ogden, Robert - English Counter Tenor specialising in opera and concert.
• Ohio Valley Symphony - Includes concert and ticket information.
• Ohlone Chamber Singers - A 46 voice choir performing a wide range of music repertiore, from Renaissance through significant 20th Century works.
• Ojima, Yoko - Soprano singing traditional and contemporary Japanese songs, operas, and arias with biography, song samples, and CD information available.
• Okashiro, Chitose - Provides profile, repertoire, discography, tour information and more.
• Oklahoma City Philharmonic Orchestra - Schedule, concerts, guest artists, personnel, performing venues and tickets.
• Olde Friends Concert Artists, Inc. - A Baroque musical duo who make accessible the beauty, intimacy, and power of Baroque music performed on original instruments.
• Omaha Symphony
• Onay, Gülsin - Provides biography, audio samples, and CD information by this Turkish pianist and State Artist.
• Onyx Brass - Formed by five former National Youth Orchestra principals.
• Opera Nova Guitar Quartet - Featuring Walter Zanetti, Monica Paolini, Giorgio Albiani, and Francois Laurent. Offers background, CD information, and repertoire.
• Opera Singers in Seattle - Bios, headshots, contact information, and web page links to Seattle-area opera singers.
• OperaBabes - Official site of opera duo Karen England and Rebecca Knight. Includes news, tour dates, and photos.
• Operabase Index - Search by performer, conductor, or producer.
• OperaStuff - Singers, companies, forum, related links, and more.
• Opus3 Chamber Trio - Consists of recorder, harpsichord, and cello.
• Oratorio Society of Minnesota - 60-voice choral ensemble based in the Twin Cities.
• Orchestra di Padova e del Veneto - Chamber ensemble founded in 1966. History, musicians, performances, recordings, and more.
• Orchestra London
• Orchestra of the Age of Enlightenment - Period instrument orchestra playing baroque, classical, and early romantic music on original instruments.
• Orchestra Seattle/Seattle Chamber Singers - Performing great orchestral literature from Baroque to world premieres. George Shangrow, Music Director.
• Orchestral News - Complete programme listings for over 70 orchestras world-wide with links to their own sites
• Orchestras Canada - National service organisation for symphony orchestras.
• Orchestre de la Francophonie Canadienne - Group of young Canadian francophile musicians performing a panorama of compositional music.
• Orchestre de la Suisse Romande
• Orchestre Métropolitain - Concert schedule and on-line subscriptions for the Montreal Metropolitan Orchestra. Members are professional musicians and graduates of Quebec conservatories.
• Orchestre National du Capitole de Toulouse - Includes history, schedule, profiles of musicians and of conductor Michel Plasson, recordings and more.
• Orchestre Symphonique de Québec - Oldest active orchestra in Canadian history. Features information on conductors, musicians, concerts, special events, and more.
• Oregon Children's Choir - To supplement the musical training offered in local schools, by providing advanced choral experiences for talented students of music. Serves the Eugene/Springfield metropolitan area.
• Oregon Repertory Singers - Internationally acclaimed choral music with information on concerts and CDs
• Oregon Symphony - Under the direction of music director and Conductor James DePreist, performs a broad range of classical and pops repertoire.
• Orff, Carl (1895-1982) (2)
• Orion String Quartet
• Orkis, Lambert - Provides information on the pianist.
• Orlando Consort@
• Ormandy, Eugene (1899-1985) (3)
• Orpheus Chamber Orchestra - Founded in 1972 by Julian Fifer and a group of fellow musicians who aspired to perform classical repertoire as chamber music and without a conducter.
• Osinchuk, Juliana - Classical pianist educated at the Juilliard School and offering workshops and recordings.
• Otten, Kees - Biography, discography, and sound samples for this Dutch recorder player.
• Owain Phyfe and the New World Renaissance Band fan club - Provides information on the artist and the ensemble.
• Oxford Philomusica, The - Professional chamber orchestra.
• Oxford Sinfonia - Amateur chamber orchestra based in Oxford that plays music from baroque to the present day.
• Ozawa, Seiji (4)