"I know that we aren't paid, and we are amateurs. We occasionally perform songs that are of more recent vintage, White Freightliner by Townes van Zandt, for example. I know others perform there, and some may be paid for it, but I doubt there are any true "professionals" involved, Q."
.....sounds like you're in the habit of playing published material and that the coffee shop is benefiting by filling his room with coffee drinking musicians.....pay ascap!