Over the holidays, Billboard’s song charts were, at least on the surface, pretty sleepy. On the Hot 100, most of the songs that were hot late last fall—Beyoncé’s “Single Ladies” and “If I Were a Boy,” T.I. and Rihanna’s “Live Your Life,” Kanye’s “Love Lockdown” and “Heartless,” Taylor Swift’s “Love Story,” the unkillable Katy Perry’s “Hot N Cold”—continued bumping around the Top 10 like lazy molecules.

But below the surface, a ton of music was being consumed. In particular, one song benefited massively from the annual iPod-filling digital megasale that hits iTunes every Christmas—and that song, Lady GaGa’s “Just Dance,” reaches No. 1 the very week Apple’s music store removes digital-rights management restrictions on all of its songs, making them freely copyable.

Does this mean we’re in for even more Lady GaGa than we’re enduring now, as kids trade their iTunes purchases like baseball cards? Unlikely: those who “share” music probably figured out their DRM workarounds years ago.

But the official start of the post-DRM era—and, more important, the changes to song pricing—could have some interesting effects on digital song sales, and the charts that track them.

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