12/15/2010 10:25 am ET Updated May 25, 2011

'The Sing-Off' Is A Breakout Ratings Hit For NBC

NBC has a breakout hit on its hands with the a capella competition "The Sing-Off."

The show, which is in its second season, saw some of its best ratings numbers ever this week, especially in the coveted 18-to-49 demo. The 9.5 million viewers who tuned in were a 31 percent jump from the same time period last year, and the 3.3 rating in the demo was the highest "The Sing-Off" has ever had.

Ironically, the New York Times reports, NBC had wavered about bringing the show back for a second season. No doubt the network is glad that it did.