Festival season is alive and popping, and Glastonbury is one of the UK’s most anticipated events. It went down over the weekend, and during Diplo‘s set (which was premiered during BBC Radio 1′s Essential Mix), he let it be known that he would be testing out some new music. While the tracklist has this listed as “ID – ID,” that’s definitely Mike Posner singing, and DAD’s hearing rumors that this nasty number is actually a new Diplo single featuring Mike Posner. We don’t have a title, but we gather it’s either “Shut It Down” or “Shut Shit Down.” Who knows. It’s the first track in the set, which you can hear below.