The Chord Wheel: The Ultimate Tool for All Musicians Paperback – Illustrated, July 1, 2002

The Chord Wheel: The Ultimate Tool for All Musicians | Music Theory Learning Tool for Guitar Piano and All Instruments | Visual Guide to Chord Progressions and Key Changes

The Circle of Fifths: visual tools for musicians

Guitar Fretboard: Memorize The Fretboard In Less Than 24 Hours: 35+ Tips And Exercises Included