Classical stuff takes a lot of rehearsal time and preparation, but with stuff that involves improvisation, you can over-rehearse it and it gets stale. You don't want it to be too comfortable. In fact, a good sound check, a good rehearsal usually means a bad performance.
John ZornNo one sits in front of a drum set and thinks they invented it all out of whole cloth. The fact that the set is there means that you've got some dues to pay to Baby Dodds.
John ZornWhen I'm writing, sometimes it gets to that place where I feel like the piece is writing itself and I'm trying not to get in the way
John Zorn