Los Angeles based Machine Project (about us) is putting on an Apple II concert performance this June 25th. One of their members, Jason Torchinsky has programmed a 16-step sequencer and will attempt to perform a “live, dynamic concert/musical event”. They want to use as many Apple II computers as possible, so they are asking area Apple II owners to help out with the performance. See site for contact info.
Thanks to 8 Bit Weapon for the tip.