Breaking a decade-long hiatus at the 2012 iHeartRadio Music Festival at MGM Grand Garden Arena in Las Vegas, No Doubt delivered a 90-minute set as part of the Push and Shove Tour that turned 20,000 people into a single, unified 90s flashback, with Gwen Stefani commanding the stage as only she can, Tony Kanal’s ska grooves locking in tight, Tom Dumont’s guitar flares cutting through the arena air, and the horn punctuations that made ‘Tragic Kingdom’ a 16-million-selling genre revival doing exactly what they always did to a crowd that had been waiting years to hear them again.