Chamber Choirs and Vocal Ensembles
- anCHORa (Freiburg im Breisgau, Baden-Württemberg, Germany)
 Ancora Ensamble Masculino (Lara, Venezuela)- Ang Passang (Trondheim, Norway)
- Angeli A Cappella Vocal Group (Lebanon)
- Angelus (Mt. Vernon, Indiana, USA)
- Anima (Saint Petersburg, Russia)
- Ann Arbor Cantata Singers (Ann Arbor, Michigan, USA)
- Anonymos (Ecuvillens, FR, Switzerland)
- Antiphon (Hexham, Northumberland, England, United Kingdom)
- Antiqua Nove (Málaga, Spain)
- The Arbor Consort (Ann Arbor, Michigan, USA)
- The Arcadian Voices (Perth, Western Australia, Australia)
- ARdeCORO (Sintra, Portugal)
- Arenaï (France)
- Aria (Glasgow, Scotland, United Kingdom)
- Aria Chamber Chorus (Dallas, Texas, USA)
- Aria de Paris (Paris, France)
- Armonía Buenos Aires (Buenos Aires, Argentina)
- Aros Vokalensemble (Västerås, Sweden)
- The Árpád Darázs Singers (Columbia, South Carolina, USA)
- Arpège (St Jean de Liversay 17, France)
- ARS ANTIQUA Aschaffenburg (Aschaffenburg, Bayern, Germany)
- Ars Cantandi (BZ, Italy)
- Ars Cantata (Warszawa, Poland)
- Ars Cantica Choir (Italy)
- Ars Cantica, Doppelquartett (Velbert, NRW, Germany)
- Ars Continuus (Buenos Aires, Argentina)
- Ars Nova (Royal Oak, Michigan, USA)
- Ars Pristina (London, England, United Kingdom)
- Ars Vocalis (Reims, Champagne, France)
- Art Cappella (Murnau am Staffelsee, Bayern, Germany)
- Arte Domino (Poznan, Poland)
- The Arts Academy Chorale of Winchester (Winchester, Virginia, USA)
- Asociacion Coral Villa de Valdemoro (Valdemoro, Madrid, Spain)
- Asociación Musical Coro "Santa María" (Coria del Río, Sevilla, Spain)
- Associazione Corale Marietta Alboni (Città di Castello, PG, Italy)
- Associazione Coro Vox Canora (Parma, Italy)
- Associazione Culturale "Boghes e Ammentos"- ITTIRI (SS) (Ittiri, Sassari - Sardegna, Italy)
- Associazione musicale Misure Composte (Bari, Italy)
- ASTER Women's Chamber Choir (Broomfield, Colorado, USA)
- Ateneo Chamber Singers (Philippines)
- Atherstone Choral Society (England, United Kingdom)
- Atout Choeur (Pays du Cognac, France)
- Audite Nova (Nijmegen, Netherlands)
- Austin Vocal Arts Ensemble (Austin, Texas, USA)
- Ave Maris Stella Vocal Ensemble (Camden, Maine, USA)
- AveSol (Latvia)
- Azimut-Gospel (Bouveret, Valais, Switzerland)
- Bach Collegium Paris (BCP) (Paris, France)
- Bach Concert Series (Baltimore, Maryland, USA)
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