If you can do it, do you do it right away? If you can't do it, do something else by the same artist that you can do? Sometimes you just can't do it, like in a country venue and someone requests "Pantera," I've honestly no clue as to any of their songs, I just know it doesn't fit the venue. The thing that makes me cringe is when someone makes a request for a song that we may have already played and then we do it again. Is that acceptable?