Dick Hyman's books (this one and its follow-up "All the Right Changes") are indispensable for study of the Great American Songbook, and not just for piano players (I play guitar). Sadly, both are out of print due to the failure of the Publisher. They correct the common errors of harmony and provide hip, alternative changes in red type (example "Here's Sonny Rollins' bridge for this tune"). It's great to learn from a master pianist. I met Dick at his Master Class at the Ravinia Jazz Festival in around 1995 and told him I thought he had the best looking hands and technique I had seen since Teddy Wilson and begged him to write several more volumes of this series of books. I found out later that as a very young fellow Dick won a radio piano contest. The prize was a dozen free lessons with Teddy Wilson!