I had really bad seats for a Fleetwood Mac concert - we were directly to the side of the stage, and hidden behind a wall, behind Mick (the drummer) was a young buck playing a digital drum kit. He played every song, and no doubt, had his audio feed pumped into the main house along with the acoustic drums that Mick was playing, but here's the thing ... at the end of the show, when the band took their bows - they never had the kid come out from behind. He was a hired gun that stayed in the shadows. Still, a good gig, but with all the tech today, he should have been featured on stage. My guess is that the bog boss wanted everyone to think he was making all that glorious sound. Yeah, right.

Henni's right - there's an interesting interview with David Rosenthal (Billy Joel's keyboard player) that shows you the triple backups they use with PCs, ipads, and redundant keyboard gear. Pretty high tech.