Sometimes one is expected to play certain tunes that the audience thinks are "show off" tunes (wherein they show off to their friends their knowledge of what's hot !?!) If you play a 5-string banjo there's always someone who wants to hear "Foggy Mountain Breakdown" or "Dueling Banjos" (which are relatively easy) and if you're a fiddler it's always "Orange Blossom Special" (which fiddlers say is hard) or in some cases "that pretty tune from the Ken Burns Civil War TV Series" ie: Ashokan Farewell (which is fairly easy). I'm longing to learn a real hokum, show-off tune, but haven't managed to find anything I can wrap my fingers around.