Chord Construction Book/Booklet
What are the notes of an F11 chord? ** What's the 3rd of an Ab chord? ** What are the notes in an E7b5b9 chord?
For a quick and easy answer, here's a handy reference booklet that will fit in your guitar case (same size as my Slide Rules book) ... and it's all in alpha numerics ... no music reading needed. Includes charts for keys of C, C#, Db, D, Eb, E, F, F#, Gb, G, Ab, A, Bb, B.