CTLawyer has the right idea. I would think – probably wrongly – that a band would turn down the music if requested by the host, without a contract provision, but the contract provision is nevertheless a great idea, and probably sets a tone for softer music (pun intended).
I’d like to hear from some professional musicians: what’s with the deafening volume? Is it a cover for the mediocrity of your musicianship? Or a way to keep guests away from you? Or have you already lost your own hearing.
I’ll be attending a simcha next month where Mommy/hostess is an otorinolaryngologyst (ENT physician). Hope the music reflects her medical knowledge.