- Groove Tubes
 - Sylmar - Manufactures vacuum tube guitar amplification, microphones, and recording equipment. - Magix
- Santa Monica
- DMX Music
- Digital service providing commercial-free, CD-quality sound via cable and Direct Broadcast Satellite (DBS).
- Big Fish Audio
- Sun Valley - Loops, breakbeats, and sound CDs.
- Spectron
- Chatsworth - Makes digital switching amplifiers.
- Wimbledon/Trigram Music Inc.
- Century City - Purveyors of musical scores and method books with a speciality in brass, winds, and percussion.
- Eleca
- Temple City - Manufacture guitar amplifiers and automobile crossovers.
- Sonic Mastering
- Encino - Mastering and replication.
- Let's Celebrate Music
- Chatsworth - Christian music, including instrumental, relaxation/meditation, and Catholic.
- Area Illusions Studio
- Team of composers, engineers, and musicians producing music for film, television, and more.
- Ed Pons Music, Inc.
- Provides music composition, production, editing, and publishing services for film, television, and multimedia.
- Los Angeles Goes Underground - L.A.G.U
- Showcase for underground rock bands.
- Dauman Music
- Beverly Hills - Specialises in representing top songwriters and record producers and placing their songs with recording artists.
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