Here are links to all the Brony musicians in alphabetical order:

AcousticBrony
Aftermath
AJ The Engineer
Alex S.
All levels At Once
Art Attack
Assertive Fluttershy
Aviators
Bagpipe Brony
BlackGryphon
Carbon Maestro
Christopher Garcia
d.notive
Daniel Ingram
David Larsen
dBPony
ElectroKasplosion
Eurobeat Brony
Evening Star
Feather
Fire of Friendship
Forcedemodo
Forest Rain
Freewave
GagueN
General Mumble
H8 Seed
Icky
Interrobang Pie
Jackleapp
Joaf the Loaf
Ken Ashkorp
The Living Tombstone
LoreRD
Makkon
MandoPony
Megaphoric
MelodicPony
Mic the Microphone
Moonswirl
Neighsayer
Not a Clever Pony
Ponyphonic
Prince Whatever
Radiarc
Regan Murdock
Replacer
Sand Josieph
Sherclop Pones
Silva Hound
SimGretina
SylphStorm
Stormwolf
ThatSonofaMich
Tsyolin
Twitch
UnderpΩny
WoodenToaster(Glaze)
Yelling at Cats