A
- ABRSM
- Acoustic
- ADAM Audio
- Adam Hall
- Admira
- Aftermarket
- Agean
- Agean Cymbals
- AGP
- Aguilar
- Ahead
- Akai
- AKG
- Alegree
- Alesis
- Alfred Music
- Allen & Heath
- Allparts
- Allsound
- Alpha
- Alphonse Leduc
- Alpine
- Alvarez
- Amedia
- Amedia Cymbals
- American DJ
- American Recorder
- Ampeg
- Anatolian
- Angela Instruments
- Antelope Audio
- Apogee
- Aquarian
- Aquila
- Argus
- Aria
- Aria Pro II
- Arrangers' Publishing Company
- Arrowzoom
- ART
- Arturia
- Ashdown
- Auden Guitars
- Audio-Technica
- Audix
- Avantone Pro
- Avid
B
C
D
E
- EarthQuaker Devices
- Eastman
- Eastwood
- EBS
- Editio Musica Budapest
- Edwards
- Eko
- Electro-Harmonix
- Electro-Voice
- Elektron
- Elite Core Audio
- Elitis
- Elixir
- EMG
- Eminence
- Empress
- Enya
- Enza Home
- Epiphone
- Erica Synths
- Ernie Ball
- Ernie Ball Music Man
- ESP
- ESP LTD
- Eurolite
- Evans
- Eventide
- EVH
- ExcelValley
- Exotic Plectrums
- Extreme
- EYParts
- E-MU Systems
F
G
- Gan
- Gator
- Gear4music
- Gemini
- George L's
- Gewa
- GHS
- Gibraltar
- Gibson
- Glarry
- Global Truss
- Godin
- Gold Tone
- Gotham Audio
- Gotoh
- Grafton
- Graph Tech
- Gravity
- Greasy Groove Inc.
- Greco
- Gretsch
- Grimm Audio
- Grover
- Grover Jackson
- Gruv Gear
- Guild
- Guitarzilla
- Guitar Anatomy
- Guyatone
- G&L
- G. Henle Verlag
- G. Schirmer, Inc.
- G7th
H
I
J
K
L
M
- Mackie
- Mad Professor
- Maestro
- Magma
- Mahalo
- Make Noise
- Manuel Rodriguez e Hijos
- Mapex
- Marantz
- Markbass
- Marshall
- Martin
- Masterwork
- Maton
- Maxon
- Mayones
- Mehteran Cymbals
- Meinl
- Mel Bay
- Mesa Boogie
- Michael Kelly
- Minotti
- mLaval Guitar Parts
- Mogami
- Mojotone
- Mono
- Mooer
- Moog
- Morley
- MOTU
- MR DJ USA
- Mr. Dj
- Music Man
- Music Minus One
- Music Nomad
- Music Sales America
- music store
- MXL
- MXR
- MyVolts
- M-Audio