If a musician or band, particularly in the popular music genre, performs a cover song for the first time in a live setting, is there a word or phrase to describe this performance? Does "premiere cover" work in this scenario and/or is there a more suitable alternative?
Secondly, if it is certain that the performer will never perform this cover again in a live setting (likely where they are broken up, no longer capable or deceased), is there a word or phrase to describe that scenario? I am thinking of something along the lines of "unique premiere cover".