NBC definitely has a lot to sing about.

The network topped Monday, powered by The Voice with 12.8 million viewers and a 3.4 in the adults 18-to-49 demographic, which boosted the Season 4 premiere of The Sing-Off (8.4 million, 2.4). The Sing-Off was up 26 percent from its Season 3 premiere, which did not follow The Voice.

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Fox was the only other network to air an all-new lineup, with Almost Human (6 million, 1.8) up a tenth and Sleepy Hollow

 (6.5 million, 2.1) down a tenth.Mike & Molly (7.6 million, 2.0) was down four tenths on CBS, while Hostages (4.7 million, 1.1) was flat.On ABC, The Great Christmas Light Fight premiered to 6.6 million and a 1.8.8 p.m.
CBS: How I Met Your Mother (R) 4.7 million viewers (1.3 demo rating); 2 Broke Girls (R) 4.8 million (1.2) ABC: Santa Claus Is Comin' to Town (R) 6.4 million (1.7)Fox: Almost Human 6 million (1.8) NBC: The Voice 12.8 million (3.4) CW: Kung Fu Panda Holiday Special 1.3 million (0.4); Merry Madagascar 1.2 million (0.4) 9 p.m.
CBS: Mike & Molly 7.6 million (2.0); Mom (R) 5.5 million (1.3)ABC: The Great Christmas Light Fight 6.6 million (1.8)NBC: The Sing-Off 8.4 million (2.4) [9-11 p.m.]Fox: Sleepy Hollow 6.5 million (2.1)CW: One Direction iHeartRadio Album Release Party 630,000 (0.2)10 p.m.
CBS: Hostages 4.7 million (1.1)ABC: Castle (R) 6.5 million (1.3)