Got lucky and saw Frank Zappa in Arlington, Tx 1971 or 72. He had about 10 or 12 musicians with him including some of the Mothers along with a few people he had been touring with in Europe. It was one of the most amazing live concerts I have seen to this day. About 20 minutes in he asked the audience if we wanted him to continue with the scripted show or deviate. It sounded unanimous, so they jammed and deviated for the rest of the show. They played a few minutes of some hot jazzy number and suddenly stopped, everyone put down their instrument and rotated to another instrument. Without a word they continued where they left off and after a few minutes they did it again. This kept up until it appeared to me that everyone had played each instrument. Just a few songs with lyrics that night, mostly just terrific music. It put me on the road to jazz appreciation.