Brands – A
- A. Schroetter
- Acanthus Music
- Accesoires
- Acme
- AcoustaGrip
- Acoustic Music
- ACS Publications
- Adam Black
- Adamas Guitars
- Admira
- Advance Music
- Agifty.At
- Aim
- AirTurn
- Ako
- Akusticus
- Alfred Publishing
- Allegro Publishing
- Alphonse Leduc
- AMA Verlag
- Ambassador Strings
- Andreas Zeller
- Angel
- Antoni
- APM
- Applause Guitars
- Aquarius
- Aquila Corde Armonic
- Aranjuez Strings
- Arcus Bows
- Art & Lutherie
- Artec
- Artemis Editions
- Artists Ahead Musikverlag
- Arundos
- Astrea
- Attack Drumheads
- Aubert
- Augustin
- Augustine
- Aulos
- Aungles
- AVID Technology
- Axe Heaven
- Axe Wax
- Azumi Flutes
