Then there's the other side of the coin, when someone refuses to do a perfectly good song or tune that they do well because it "belongs" to another person with whom they've had a falling out. I used to play in a band that had two fiddlers and the two of them had a parting of the ways. As a result, that band broke broke up but the members regrouped into two new groups with one fiddler each. All of the tunes that had been introduced into the repertoire of the old band by fiddler A were shunned by fiddler B and vice versa. Suggestions for tunes at practice sessions were often met with, "No, I don't want to do that one. That's one of so-and-so's tunes." Sheesh! Can you say "petty"?

Bruce