The people I sat next to asked me "Who is this guy?" I responded with "Just wait until the last song, you'll sing along!". By the time the opening act sang his first ever radio single everyone in the crowd was up and cheering and singing "All on Me" at the top of their lungs.
When I saw a picture of him I was convinced I had seen him somewhere. Maybe you are thinking the same thing. Remember that YouTube video that went viral of a guy and a girl back to back singing Taylor Swift mash up songs?