"Since its inception in 2011, this festival has become the can't miss music event of the year. "Year after year, the iHeartRadio Music Festival continues to captivate audiences nationwide," Tom Poleman, Chief Programming Officer for iHeartMedia, said Tuesday. The awesome lineup also includes Cage The Elephant, Chance The Rapper, Def Leppard, French Montana, Halsey, Heart, H.E.R., Mumford & Sons, Tim McGraw, Zac Brown Band, Hootie & the Blowfish, Marshmello and Steve Aoki with special guests Darren Criss and Monsta X. The music festival, hosted by Ryan Seacrest, will take place on Friday, Sept. On Tuesday morning, iHeartMedia announced the star-studded lineup for the annual two-day event, with Miley Cyrus, Alicia Keys and Camila Cabello all set to take the stage at T-Mobile Arena in Las Vegas. The 2019 iHeartRadio Music Festival is jam-packed with incredible performers!