The members of WU LYF have been eager to shed some of the mystery they built up early in their career—and an appearance on David Letterman’s show will certainly help with that. “Heavy Pop” is one of the standouts from Go Tell Fire to the Mountain and it sounds even more confident in its live incarnation, with singer Ellery James Roberts delivering his gruff vocals while his group builds up a head of steam behind him. It will be interesting to see where WU LYF goes from here, as Roberts’ unintelligible vocals might be a tough sell on a second or third album. But for now this sounds like a band at the top of its game. Check out the Letterman appearance in the clip below.