I'm not normally the kind of person to quote sci-fi novels, but this bit from Heinlein's "Stranger In A Strange Land" seems very relevant to making good live shows. The deal here is - the only person on Earth who has powers like levitation, telekinesis, making objects disappear etc. gets fired for being a lousy stage magician. The guy running the carnival gives him some parting advice about how to get better. Reading it I thought that I know some musicians who definitely have the same problem and could use the same advice, though obviously without the massive disdain for the audience. Thoughts?