“The city has run out of rehearsal space. These days there’s hardly anywhere for a cello and a marimba to meet. In neighborhoods across Boston, musicians lug unwieldy instruments up the stairs of triple-deckers for “house” rehearsals because it’s the only place to practice. But leases routinely prohibit the playing of instruments, and, in any case, apartment rehearsals are limited to the goodwill and noise tolerance of neighbors.”