UPDATE - 2/9@11:14AM: Here's some camera phone video of the band's cover of Tom Sawyer from last night's show:

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Imagine Dragons are a Grammy Award winning alt-rock band from Las Vegas. They are coming off a highly successful 2013 which saw them named by Billboard as The Breakthrough Band of 2013 and where Rolling Stone named their single Radioactive the biggest rock hit of the year. They'll be embarking on an arena tour which kicks off tomorrow night in Boise, Idaho and they told Rolling Stone that they'll be performing a cover of Rush's Tom Sawyer:

During their years as a club band on the Las Vegas strip, Imagine Dragons covered more than 100 songs, by everyone from U2 to the Cure. For their upcoming arena tour, which kicks off on February 8th in Boise, Idaho, the band wants to step up its game, but also pay homage to their early days. The group ultimately chose to learn Rush's "Tom Sawyer."

"It's just an intimidating song," says frontman Dan Reynolds of the 1981 prog-rock classic. "It's so cool, because I found this whole new register. I've been taking additional voice lessons and figuring out how to tune into my upper range more. The band loves prog, so it's kind of their dream." ...