Urie joined Halsey for performances of her song "New Americana" as well as his 2005 hit, "I Write Sins Not Tragedies." and video of the jam has been posted online.

Followers of Urie's Periscope feed will recall the singer covered "New Americana" last year during an impromptu piano session in his living room. But how and whey did Halsey and Brendon find friendship? The two became friends after the New Jersey born singer, a self-admitted fan of Panic!, reached out to Urie last November sheerly out of fandom.