Rocklahoma has reveal their 2017 lineup, with Def Leppard, Soundgarden and The Offspring headlining the three-day weekend May 26-28 in Pryor, Okla. Also will feature Stone Sour, Seether, Three Days Grace, The Cult, Pierce the Veil, The Pretty Reckless, Ratt, Skillet, Jackyl, Taking Back Sunday, Buckcherry, Fuel, and more.