Bests & Worsts Reviews from Amazon

This is an incredibly easy intro to music theory. It shows which chords sound good with other chords. It shows how simply folk and rock songs are put together (3 or 4 chords, usually). I'm an "adult beginner" on piano and keep it on the piano at all times. It helps me figure out how to accompany myself once I've picked out a tune. I may even be on the verge of composing a song, thanks to this simple tool. Changing keys seemed impossibly difficult until I got this. (If you've ever wondered what is meant by the I, IV, V chords, get this and life will make sense.) Most of all, it's fun. Highly recommended.