Frederick Harris Music Company - A progressively graded series of books, CDs, cassettes, and MIDI discs. Music Minus One - Participatory recordings and accompaniment music for musicians and vocalists, including all styles. Berklee Press - Books and recordings covering all instruments and all main music topics. Dr Downing Music - Troubleshooting books for all musicians. Cassette and Video Learning Systems - Instructional books, DVDs and video for guitar, bass, keyboards, drums, harmonica, banjo mandolin, violin and fiddle. Mike Mangini's Rhythm Knowledge Online - It offers rhythm instruction materials for all instruments. ADG Productions - Books, CDs, videos and software for most instruments and styles. Southern Music Company - Sheet music and methods for all instruments and ensembles. Edly's Musical EdVentures - Sells two books: one to learn music theory and one for piano. Music in Motion - Sells books, videos, audios, awards, teaching aids, posters, gifts and software. Flying Leap Music - Publishers of You've Got Rhythm, a method to learn and improve music-reading skills. Creative Horizons Music - Sells biblical psalms sheet music, a chord scale chart, and a handbook explaining music theory. Comp-U-Xpress, Inc. - Offers songbooks and instructional books, CDs, and DVDs for various instruments and styles. Allegro Music Online - Complete line of products including popular piano methods and Suzuki materials. ModRock.com - Guitar tabs, books, videos, sheet music, and CDs for all instruments. Musicridge - Offers instructional videos for accordion, stringed instruments, drums, and brass ensembles. Ron Greene's Music Dials - Visual reference guides that show the chords and scales you can play with all instruments. Letsplaymusic.com - Offering several educational books for accordion, harmonica, and guitar. Perfect Pitch - Offers a training program by David Lucas Burge, designed to teach pitch recognition by ear. Includes research information, and a partial lesson. Homespun Music Instruction - Wide selection of DVDs and CDs for all instruments and styles.