harpgirl, I was in the room when this happened. You left too soon to see the outcome, which was that Katcina, as room administrator, allowed the person (who was singing to a karaoke track) to finish her number and gently told her what the room was all about. Kat encouraged her to stay and sing a cappella if she couldn't accompany herself on a instrument, and she ended up singing several more that were very enjoyable.

I'll admit that the room is a bit wilder tonight than I've seen it in a long time, but everyone still seems to be having a good time.