Dizzy Up the Girl" is the band's sixth album, and it showcases a sweeter, more accessible sound. The album has sold more than 3 million copies. A fourth single from it -- "Broadway" -- was released March 28.

"I was hoping that the record would do well, of course, but I didn't think it was going to do as well as it has," Rzeznik said. "Things just evolve. I sort of have no control over what happens with the songs. Sometimes I'm afraid I might wake up one morning with an entire record of polka songs."

Rzeznik has already been writing for the band's next album, but no release date has been set. "It's 10 seconds of inspiration and 10 months of being annoyed and having to do the day-to-day pounding of actually hammering into it," Rzeznik said. "It's all so tentative right now. It's hard to even say what the heck it's going to wind up being."

Rzeznik has used his new visibility to branch into other areas of interest. He was a guest on Politically Incorrect and has hosted programs on MTV and VH1. He's also writing music for a Disney project and for "some people I respect a lot and grew up listening to their records and really loved them." (He wouldn't get more specific than that.)