If you’re happy and you know it, clap your hands! Turns out, clapping is as infectious as a communicable disease, a social contagion that spreads through a crowd rather than the summation of individuals’ spontaneous responses to a moment of rapture.

Greta Bradman, Applause, Classical Music Greta Bradman

So, in live performance, is concert etiquette of “no-clapping-until-the-end” a handy workaround, a buffer against the effects of infectious clapping? I asked around, and to quote...

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