The old throw out a key where he won't have the harp, not just for harp players. Odd keys weed people out or in for that matter. I hate lists as a jammer, and really really hate them as a "conducter/organizer". Which I am retired from. You can't put good players up with raw amateurs and expect them to come back for more. Definitely takes a while to get in with players when you are new and don't have friends to introduce you around.