Berklee Press - Books and recordings covering all instruments and all main music topics..
Cassette and Video Learning Systems - Instructional books, DVDs and video for guitar, bass, keyboards, drums, harmonica, banjo mandolin, violin and fiddle..
Music Minus One - Participatory recordings and accompaniment music for musicians and vocalists, including all styles..
Musician's Workshop - Video and audio products for string and keyboard instruments, harmonica, and tinwhistle..
MusickEd.com - Study guides and learning tools for all instruments. Also online lessons..
Musicridge - Offers instructional videos for accordion, stringed instruments, drums, and brass ensembles..
Musicroom.com - Music tuition and music-related books for all instruments..
MVP: Music - Offers an extensive collection of instructional videos..
One Day at a Time - Offers a selection of musical instructional products for all instruments and styles..
Perfect Pitch - Offers a training program by David Lucas Burge, designed to teach pitch recognition by ear. Includes research information, and a partial lesson..
Pro Audio Music - Wide selection of books, videos, CDs and software for all instruments and music topics..
Ron Greene's Music Dials - Visual reference guides that show the chords and scales you can play with all instruments..