Here's a great book to check out from our friend Jeff Johnson on the Stone/Morello level system. The book categorizes the four strokes that Joe Morello taught and how to apply them to drum set grooves. It also outlines the level system and how to use it to create accents, dynamic changes and rudiments. It's a great book for learning this technique, and also a great tool for teachers. I am glad to see that Jeff has shared his lessons with Joe Morello with this fabulous book.