Peacock as in "John Peacock", not as in the bird. This tune was originally a song with sexually explicit lyrics. I submitted this for Jack after a discussion about single jigs. This tune should probably be classed as a single jig or fling maybe, but I think it sounds quite good played quite fast like a slide. This version comes from the Northumbrian Minstrelsy.
Unless I’m mistaken, this isn’t necessarily Em but could be G major as well.