Closing out the inaugural iHeartRadio Music Festival at MGM Grand Garden Arena in Las Vegas in 2011, Lady Gaga extended her planned 45-minute set into a full hour she called a “Surrogate Monster Ball,” moving through explosive renditions of “Bad Romance,” “Just Dance,” and “Poker Face” against a biker-themed stage production before the night shifted into something far more personal, with Gaga delivering an acoustic version of “Hair” dedicated to Jamey Rodemeyer, a young fan who had recently died by suicide after being bullied, and closing with a surprise duet alongside Sting that cemented the entire set as the defining moment of the festival’s first edition.