The worst singing accident I have witnessed was when Garnet Rogers was thrown to the ground by an electrical shock. For a while we were worried that he needed C.P.R., but he came out of it. Still ok i hope!

what sort of disasters have you experienced or seen during musicmaking?

It seems I recall of a tornado tearing up the stage at a festival in canada not too long ago..

and of course there were those who were trampled to death in Germany recently at a "Peace Festival"

I do remember a power outage once, where the performers continued to perform un-plugged and the audience members shined flashlights on the outdoor stage. (strawberry music festival)