Some of the blues type music I bought is incredibly hard to play, the timing, the speed of the required movements, the huge number of flats and sharps, the complex chords make it difficult. This book has playable music... and it sounds good, even if one doesn't play it necessarily at top speed. There is a lot of material in this book, I've been working an hour every day for a couple of months, and I'm not even half way through. Good stuff. I'm feeling that I'm starting to develop my own boogie style, and improvize too. Heads up -- this is excellent book.