I am a professional pianist, more or less self-taught, and I first found this book in the Miami public library in 1984 or thereabouts when I was playing piano on cruise ships. I have bought two copies since, one of which went to a girlfriend. It teaches you the structure of music, the real stuff you need to know. And it's written with great charm and humour. Don't be misled, it'll teach you far more about piano playing than many music teachers. And at about quarter the price of one lesson. I love this book.