Last holiday season was cold and lonely for Imagine Dragons. Guitarist Wayne "Wing" Sermon said, "On January 1, we were performing in Alaska for just a handful of people. It was minus 20 degrees and I remember thinking, 'How did we get here?'" A year later, the Las Vegas rockers' career outlook is decidedly sunnier. Their hit single Radioactive earned Imagine Dragons two Grammy Award nominations, one for record of the year and one for rock performance.