This book is a much needed explination of the insanity of Les Claypool's bass style. His slap bass style with bits of tapping, usually on a 5 string bass, occasionally fretless. I have been trying for years to decifer les's music, and now it's finally possible. worth every penny and every second of practice. This is perfect for any primus fan who is instrumental, but be warned, Les' music "is!" as hard to play as it sounds. Have fun.