- Art & Lutherie Guitars
- ACME
- Admira Classical Guitars
- Admira Guitars
- AKG Microphones
- AJP
- Alpine Ear Plugs
- Anton Breton
- Anton Breton Bows
- ANGEL PERCUSSION
- APJ
- Aquila Strings
- ANTIGUA brass accessories
- Aquila
- Argentine
- Argentine Strings
- Aria
- Aria Guitars
- Artec Electronics
- Ashbury
- Astrea
- Astrea Violin Strings
- Astrea Strings
- Atlas
- Atlas Percussion