Justin Bieber's new "Heartbreaker," which leaps 77-13 on the Billboard Hot 100, is a moody, downtempo R&B ballad that doesn't sound like any of his previous lead singles. That's partly because "Heartbreaker," which hit iTunes Oct. 7, doesn't precede a traditional full-length, but instead kicked off a series of 10 singles dubbed "Music Mondays," with a new song dropping each week through mid-December. The series will lead directly into the Christmas Day release of "Believe 3D," the follow-up to the 2011 concert film "Justin Bieber: Never Say Never."

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