I went to a PDQ Bach/Peter Schickle concert once where he unrolled a huge line of music on the stage and the musicians played it in all sorts of way while he talked. They played it straight, they played it upside down, they played it backwards, and they played it as a cannon/round in all of those ways. As always, his commentary was musicologically (is there such a word?) impeccable...and we were in stiches. I swear, the more you know, the funnier he is.