Yesterday, I mentioned that serious jazz musicians rehearse very little, which is true. But I want to be clear what I mean by that. By "rehearse", I mean playing with other musicians, which is not the same thing as "practice", which is done individually. Jazz musicians practice constantly. (The term they use for it is "woodshedding", as in, "I'm going back to the shed". It comes from the structure in Charlie Parker's Kansas City backyard that became legendary for the heavy practice hours that it hosted.) But everything that is practiced, from ear training to memorizing vocabulary to the detailed study of the history of both style and instrument - is done so that they don't have to rehearse. Bill Evans, the piano giant and one of the hardest-working musicians ever, once said that in the ten or so years that he played with one of his trios, they'd had about four rehearsals. But when the gig started, they "got it together very quickly on the bandstand". For evidence of the results, listen to any of his records.