No song spent more time atop the Billboard Hot 100 last year than Robin Thicke's "Blurred Lines," which logged 12 weeks at No. 1 and set the all-time record for radio audience when it reached 229 million listeners in a week. It did so by tapping the sound of classic R&B, which has sparked both controversy -- its groove is close enough to Marvin Gaye's 1977 No. 1 hit "Got to Give It Up" to have sparked a since-settled suit involving the Gaye family-and ongoing discussion.

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