Tom Petty [ tickets ] and The Heartbreakers join The Dave Matthews Band and John Mayer to headline the first annual Mile High Music Festival in Colorado July 19-20. The two-day fest will be held just north of Denver, at the Outer Fields at Dick's Sporting Goods Park.

Other artists to appear at the Mile High fest include The Black Crowes, O.A.R., Michael Franti & Spearhead, Rodrigo y Gabriela, Steve Winwood, Spoon, Flogging Molly and Colbie Caillat, among others. Petty headlines the July 19 show while Matthews heads up the July 20 bill.