The show was a warm-up for the band's North American tour, which kicked off Thursday in Chicago. "I really enjoyed watching Queen break out some of my favorite songs," posted Sixx. "It was great to be able to sit down with them artist to artist during the pre show interview. I look forward to doing more of these for iHeart Radio Live."

Things have come full circle for Lambert, who auditioned for American Idol five years ago by singing Queen's "Bohemian Rhapsody" and "We Will Rock You."