Billy Ward: Big Time
If nothing else it was an exercise for the left side of the mind. His concept of Big Time, layering as many rhythms as possible (i.e.-click your teeth, tap your heel, sing your own little melody, etc.) despite the mics not hearing it just so it feels as good as possible to your bandmates was interesting. He presents so many little nuances to spark creativity...don't expect much instruction for technicality, but you can't help buy get inspired by it!