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Colbie Caillat, "Breakthrough" (Universal Republic)
"Bubbly" singer/songwriter hit is big with her low-key sweet first album, "CoCo." She returns with a glossier, deeper effort that is sure to avoid sophomore slump with help from such notables as "American Idol's" Kara Dioguardi, and hit makers John Shanks, Rick Nowels and her dad, Ken Caillat, who helped record a few albums you may have heard of: Fleetwood Mac's "Rumours" and "Tusk."