It often happens, somewhere between the 47th repetition of a two-bar phrase and the conductor insisting that we’re somehow playing too loud and too quiet, that an orchestral rehearsal begins to unravel. Tempos crawl, backs begin to ache, and even the most devoted musicians quietly reconsider their choices in life. Remarkably, ‘Play for a Day,’ organised as part of the University Music Society’s 150th anniversary celebrations, managed to avoid this fate entirely.