1. The Chord Wheel: The Ultimate Tool for All Musicians (Click Link to Check Price on Amazon)
Editor's Rating : 9.2 out of 10
Hal Leonard

2. Berklee Music Theory Book 1 (Book/online audio) 2nd Edition (Click Link to Check Price on Amazon)
Editor's Rating : 9.6 out of 10
Used Book in Good Condition

3. Berklee Music Theory Book 2 (Book/Cd) 2nd Edition (Click Link to Check Price on Amazon)
Editor's Rating : 8.8 out of 10
80 PagesAuthor: Paul Schmeling

4. Guitar Wheel Music Theory Educational Tool (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
The Guitar Wheel is a visual two-sided music theory tool for guitar and piano players, and any musician covering every musical key.The Guitar Wheel contains a book's worth of music theory, while still fitting in your guitar case. The back side (piano side) has music theory for all musicians.

5. Primer Level - Theory Book: Piano Adventures (Click Link to Check Price on Amazon)
Editor's Rating : 9.5 out of 10
BOOK48 pagesSize: 12" x 9"Composer: Randall FaberISBN: 1616770767