Chamber Choirs and Vocal Ensembles
- !KEBATAOLA! (Maribor, Slovenia)
- The "Pokroff" Chamber Choir (Moscow, Russia)
- The "Voices of Africa" Vocal Ensemble (Pennsylvania, USA)
- 4-tune (Retie, Belgium)
- 441 Hz Chamber Choir (Gdansk, Poland)
- 6 Voices (Chongqing, CQ, China)
- 6cant (Berlin, Germany)
- a capella NOREIA (Kärnten, Austria)
- A Cappella (Penzance, Cornwall, England, United Kingdom)
- A Cappella Plus (Nanaimo, British Columbia, Canada)
- Aachener Kammerchor (Aachen Germany, Germany)
- Aad Hoc Kamerkoor (Amsterdam, NH, Netherlands)
- Abant Cuartet (Alcañiz, Alcañiz (Teruel), Spain)
- Aberdeen Vocal Ensemble (Aberdeen, Scotland, United Kingdom)
- Academia Ars Canendi (Altivole, Italy)
- Acappella Grup 34 Korosu (Istanbul, Turkey)
- Acappellago, NFP (Naperville, Illinois, USA)
- The Accord Singers (West Yorkshire, England, United Kingdom)
- Accordissonanti (Pinerolo, Torino, Italy)
- Ad Libitum - koret (Trondheim, Trondelag, Norway)
- Adelaide Chamber Singers (South Australia, Australia)
- Adesso Choral Society (Ridgefield, Connecticut, USA)
- Adult Chamber Choir - The Hartt School Community Division (West Hartford, Connecticut, USA)
- AEternum (kofja Loka, Slovenia)
- Aeternum (Prekmurje, Slovenia)
- Afines y Afines (Montevideo, Uruguay)
- Ágora de Segovia (Segovia, Spain)
- Agrupación Coral Alfa-Omega (San José, Costa Rica)
 Aire Valley Singers (Shipley, West Yorkshire, United Kingdom)- Aitone (Nottingham, England, United Kingdom)
- Die Akademischen Maulaffen Regensburg (Regensburg, Bayern, Germany)
- Alio Modo Canticum (Italy)
- Aliqua (Vancouver, British Columbia, Canada)
- Allegro Voce (Denia, Alicante, Spain)
- AllerCappella (Verden, Germany)
- Almodí Cor de Cambra (Valencia, Spain)
- Altebasso (Sint-Truiden, Belgium)
- ALTI NOKTA KÖRLER DERNEĞİ İSTANBUL ŞUBESİ ÇOK SESLİ KOROSU (Istanbul, Turkey)
- Amabile Neerpelt (Belgium)
- Amadeus - The Chamber Choir (Formby, Merseyside, England, United Kingdom)
- Amadeus Kammerchor (Trecate, Italy)
- Amalgam, chorale de jazz à Paris (Paris, France)
- Amare Cantare (Portsmouth, New Hampshire, USA)
- Amberger Chorgemeinschaft (Amberg/Oberpfalz, Germany)
- American BarberBoys (Missouri, USA)
- Ames Chamber Artists (Ames, Iowa, USA)
- Amici Cantores (Milan, Italy)
- Amici Chamber Choir (Harrow, London, England, United Kingdom)
- De Amsterdamse Cantorij (Amsterdam, Netherlands)
- AMUSE (New York, New York, USA)
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