The ultimate tool for all musicians. You'll master chord theory, in minutes! The Chord Wheel is a revolutionary device that puts the most essential and practical applications of chord theory into your hands. This tool will help you: Improvise and Solo - Talk about chops! Comprehend key structure like never before Transpose Keys - Instantly transpose any progression into each and every key Compose Your Own Music - Watch your songwriting blossom! No music reading is necessary.