Few modern-era rock bands have endured more of a public flogging than Nickelback. (The latest? A crowdfunding campaign to keep the band from performing in London.) Yet, despite a cool factor that makes Limp Bizkit look like Led Zeppelin in comparison, the Canadian four-piece is one of the most successful acts of the millennium, with 20 million-plus albums sold, according to Nielsen SoundScan -- and that's just in the United States. So it's doubtful that devotees would expect, or even want, anything other than the band's usual high-impact riff-rock and power ballads.