Jay Nordlinger has an excellent piece describing audience noises during musical performances. Everything Mr. Nordlinger writes, on any subject, is interesting and this is no exception:

Audience noises-audience nuisances-are many and varied. There are cellphones, of course. But worse than the ringing of a cellphone is the clucking and scolding that follows it. The guy feels bad enough already, probably. But other audience members have to pile on, and add to the disruption.