A ceilidh band I know do not charge for playing music - they would probably be doing that anyway. They charge for getting there and back and setting up and taking down their gear. The music comes free.

I was at a festival this weekend and watched the musicians arrive - since my stall was at the "stage door".

I can tell you the campers with their posh mobile homes and those in tents with posh cars drove better vehicles than any of the musicians. I would guess the campers were engineers.

I will remind you of the joke where a number of people arrive at the gates of heaven - when the poorest arrives instead of the usual questions St. Peter asks the person - what instrument did you play?