Colbie Caillat is back with Breakthrough

Last time around, Colbie Caillat was feeling "Bubbly," and the entire pop world seemed to want a sip. But this time, effervescence flirts with explosiveness. For her sophomore album, Breakthrough, Colbie has shaken up her sound, bringing in a wider array of producers and players, and significantly picking up the tempo at times from her debut effort's signature ballads. So keep an eye on those carbonation levels: champagne corks may fly.

You'd be hard-pressed to consider an album as accomplished and successful as Coco an accident, yet that's almost what Caillat's 2007 freshman release was. The sudden mania it created at radio and retail "was a surprise for me," Caillat says, "because I hadn't really been in this business yet. I hadn't been doing shows. I wasn't trying to get signed. I just was this girl who wrote songs and put them up on MySpace." By the time Coco was released to stores, "Bubbly" was already enough of an airplay sensation that the album debuted at No. 5. The massive success of a second single, "Realize," helped push the album to over 2 million shipments, in addition to almost 6 million individual digital tracks that were sold. "It all just happened naturally," says Caillat-"and now I have to keep up with it."