A variation on the problem is when you get put in a "workshop" format with several players or groups on stage, doing numbers in rotation, and one participant does all 100-verse ballads and takes vastly more than his/her/their share of the total time.

"...In Sir Patrick Spens I clean forgot the 42nd verse, so I sang the 27th, twice as loud and in reverse, and no one noticed...."

Peter.