There were some high notes and low notes for NBC’s new musical experiment (The Sing-Off). Although the network saw its best demos in that time period since September (sorry, Heroes!), the Peacock still came in third with both the viewers and the demos last night.

8pm

• How I Met Your Mother (10.2 million, 3.9/11 in 18-49) had an additional 1.1 million lighting up.
• Accidentally on Purpose (9.3 million, 3.3/9) picked up 1 million.
• The Sing-Off (2.3/6) averaged 6.9 million over two hours.
• House* (2.1/6) turned in 6.7 million.
• Jennifer Hudson: I’ll Be Home For Christmas (1.2/3) only drew in 5.6 million for ABC.
• The Vampire Diaries* (0.7/2) kicked off its marathon with 1.6 million.

9pm

• Two and a Half Men (16.3 million, 5.2/13 in 18-49) was the most-watched show of the night.
• The Big Bang Theory (15.6 million, 5.6/14) had the best demos of the evening.
• Lie to Me (2.2/6) scored 6.6 million.
• Find My Family (5.4 million, 1.4/3) lost 500,000.
• A second dose of The Vampire Diaries* (1.4 million, 0.6/2) saw less than the first.

10pm

• CSI: Miami (14.1 million, 4.1/11 in 18-49) improved by 1.2 million.
• The Jay Leno Show (4.8 million, 1.5/4) did about the same.
• Castle* (1.1/3) registered 4.3 million.

*denotes repeat

(You can review last Monday’s ratings here.)