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The first Billboard chart of 2010 looks a lot like the last one of 2009, with Susan Boyle and I Dreamed a Dreamsitting pretty at No. 1… except with about a fifth of the sales. Yes, Ms. Boyle’s numbers finally dropped, from over 500K to a relatively paltry 137,000 this week. Did she finally reach her saturation point?

Clearly not yet saturated are our friends Alvin and the Chipmunks, who finally break into the Top 10 with the soundtrack to their “Squeakquel.” Coming in at No. 7 with sales of 51,ooo, Alvin, Simon, Theodore, and the Chipettes (don’t miss that “Single Ladies”cover) are enjoying the popularity that comes from being discovered by a whole new generation of children who will someday, hopefully, grow out of their questionable taste.

Elsewhere, your charts are quite familiar-looking: Gaga comes in at No. 2 with 82,000 sales of The Fame, while its accompanying Monster lingers down at No. 9; both Gleesoundtracks are in the Top 20; and both Alicia Keys and Mary J. Blige remain in the Top 5, albeit with far diminished sales from those halcyon pre-Christmas days.

They’re already predicting a No. 1 record for Ke$ha next week, thanks to the momentum behind “Tik Tok”. Will she finally unseat Boyle? And what music did you use your gift cards and returns on this holiday season, Mixers?

(Follow the Music Mix on Twitter: @EWMusicMix.)

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