iphones making music

at the concert i went to in seoul on sunday, there was an older japanese guy who put on this performance. he was a professor somewhere and he didn't speak any english (as i discovered when i tried to talk to him after the show)...but he wrangled 20 iphones into this piece. he set them up and then had the audience participate and touch them while he was manipulating it from his computer somehow. it's pretty wonderful.