Actually, that reminds me of something I heard a year or so ago... The band Muse were planning to be the first people to ever play a concert in zero gravity. Basically, they were waiting till Richard Branson made his Virgin Galactic (or whatever it's called...) operational and open to the public, then play a (recorded, presumably) concert in the hour or so of zero-gravity that you'd get on such a flight. Sounds nifty. And really shows how rich Muse are...