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The Sing-Off finale didn't exactly reach fortissimo, but it helped NBC win the night with its 2.7 rating among 18-to-49-year-olds.

The two-hour show averaged 8 million-plus viewers, but was down 18 percent in the demo from the previous Monday. The premiere of Perfect Couples, which followed it at 10/9c, attracted just a 1.9 in 18-49.

"Sincerity" helps The Sing-Off's winning group rise above the rest

Elsewhere, Fox's two-hour debut of Million Dollar Money Drop posted an equally underwhelming 1.9 — the same as last week's Lie to Me rerun, but worse than the 2.4 for a House repeat.

Ratings: The Sing-Off hits even higher notes

Skating With the Stars remained stagnant (1.1, only slightly better than the 0.8 of the previous two Mondays), while The CW's repeats of 90210 and Gossip Girl each amounted to a 0.4.

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Meantime, as 2010 draws to a close, MTV is crowing about a 16 percent year-over-year ratings increase among 12-to-34-year-olds — the network's largest annual increase since 1999. That's thanks to such shows as Jersey Shore — the network's most-watched series ever — and Teen Mom.

And MSNBC is touting how it beat CNN for the second straight year in prime-time among 25-to-54-year-olds — and for the first time in total viewers (873,000 vs. 641,000). Fox News Channel's ratings, however, continue to be more than double MSNBC's and CNN's combined.