I don't mind a few lines and dialogue that give a backdrop to the song about to be sung. At least you have an idea where and when you are from the outset.
Re apologising for a performance in advance. I remember the pop group The Tremloes saying that they were about to sing their new single but warned it might be a bit rough then proceded to give a flawless performance of Silence Is Golden.
Nudge nudge, say no more boys.