Those paying attention to Imagine Dragons' meteoric rise shouldn't find the news too surprising. After breaking onto the scene with debut single "It's Time," the Las Vegas rockers scored one of 2013′s monster hits with "Radioactive," which peaked at No. 3 on the Hot 100 and reigned on both rock and alternative charts, actually breaking the record for longest time spent atop the Billboard Rock Songs chart with 23 weeks at the peak.