Glamour Moments

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. The making of Breakthrough was far more purposeful than the ramshackle sessions that became Caillat's first album. "We tried different versions of a lot of the songs-some raw and acoustic; some with lots of harmonies and others with 20 more instruments than needed to be there-just to see which version sounded best. We ended up having a lot of variety." But for all this diversification, there's at least one carry-over and constant: the front-and-center intimacy of Caillat's vocals, which fans already relate to comin...