2018 iHeartRadio Music Festival Lineup Revealed Justin Timberlake, Jack White, br Carrie Underwood, and Mariah Carey will headline the festival The lineup includes: • Imagine Dragons br • Jason Aldeanbr • Sam Smith • Luke Bryan br • Lynyrd Skynyrd br • Panic! At the Disco • Kelly Clarkson br • Shawn Mendes br • Kygo • Rae Sremmurd br • Logic br Hosted by Ryan Seacrest, the festival will be broadcast live via iHeartMedia radio stations nationwide and on CWTV.com.