I vividly recall a jam session several years ago at a major Canadian folk festival, in which I had opportunity to jam with some of the world's great mandolinists, (Ronnie McCoury, Tim O'Brien, David Essig, and others) in what started out as a bluegrass session. Things were going great until a well known (and well-oiled) Irish fiddler happened by and interjected himself into a break by launching into a ten minute set of tunes. The etiquette of bluegrass music dictates the taking of "breaks", opportunities for all participants to solo. After 10 minutes of Irish fiddling, another fiddler amongst the onlookers launched into a set of his own. The resultant sound of mandolin cases opening and shutting was deafening! The bluegrass element moved to the next room, along with most of the onlookers.When the session was re-established and once again in full swing, the fiddlers reappeared in the crowd, only to be greeted with a chorus of "Bugger off!" from the assembled multitude.
Aux grandes maux, les grandes remedes! (For big problems, use strong remedies!)