They're playing at Illinois State University as part of their North American tour.
Band buses stationed outside Braden Auditorium generated even more interest from excited fans.
They're playing a nearly sold out show, and people we spoke with say they can't wait.
Terra Miller made a point to be front of the line when tickets went on sale, so she wouldn't miss her chance to see them perform live.
"I was worried there was going to be tons of people so I made sure I was here within the first 20 minutes and got my tickets, got the good seats, so I was really excited."
American Idol winner Phillip Phillips will open for the band.
The show starts at 7:30pm.