u-he
UDG
UDO Audio
Ueberreuter Verlag
Ueberschall
Ufip
Ugur
ujam
Uke Leash
Ullstein
Ullven Mutes
Ulrich Bass
Ultimate
Ultimate Ears
Ultrasone
UNiKA
Union Musical Ediciones
United
United Studio Technologies
Universal Audio
Universal Edition
URSA
USA Meyer
UT Orpheus Edizioni