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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.

"Interview hits dissonant chord with John Zorn" by Lee Hildebrand, www.sfgate.com. August 26, 2010.
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