This little gem is PERFECT companion for "Pocket Changes Volume 1". It has chord progressions only (no melodies) for over 400 standard songs. Noduplication with Volume 1! If you play piano, bass, or guitar, you MUST get this book. This is NOT some book that "might" help you - this is a proven and handy tool that is used by all kinds of musicians (like US!) on every single jazz gig they play.