How genius was it of the Sing Off and NBC to do a Christmas show with the various Sing Off contestants? A really great idea in my book. The following are the videos from the performance in case you missed it.

Sing-Off Xmas: Champions Opening Performance
The Sing-Off victors from all three seasons come together for a performance of “Christmas (Baby Please Come Home).”

Sing-Off Xmas: Pentatonix
Season 3 winners Pentatonix perform Justin Bieber’s new Christmas hit, “Mistletoe.”

Ben and Sara’s Collaboration
Ben and Sara decide to perform “Baby It’s Cold Outside” together, but not without their fair share of disagreements.

Sing-Off Xmas: Ben Folds and Sara Bareilles
Sing-Off judges Sara Bareilles and Ben Folds embrace the holiday spirit with their rendition of “Baby, It’s Cold Outside.”

Sing-Off Xmas: Committed and Afro-Blue
Committed and Afro-Blue collaborate with their soulful sounds for their performance of “Ooh Child.”

Sing-Off Xmas: Street Corner Symphony
Street Corner Symphony of Season 2 performs “Hallelujah.”

Sing-Off Xmas: Delilah and The Backbeats
Delilah and The Backbeats collaborate for a performance of “All I Want for Christmas Is You.”

Sing-Off Xmas: Flo Rida with Pentatonix and Urban Method
Guest performer Flo Rida collaborates with Pentatonix and Urban Method for a performance of his hit single “Good Feeling.

Sing-Off Xmas: Nick Lachey and Vocal Point
Host Nick Lachey and Season 3 contestants Vocal Point perform “Let It Snow.”

Sing-Off Xmas: North Shore
North Shore gets back to its roots with a performance of “Little Saint Nick” by The Beach Boys.

Sing-Off Xmas: Jerry Lawson’s Orchestra
Jerry Lawson is helped out by The Sing-Off contestants in his performance of “Sweet Soul Music.”

Sing-Off Xmas: Collegiate Performance
College groups Beelzebubs, The Dartmouth Aires and On the Rocks come together for a performance of “Santa Claus Is Coming to Town.”

Sing-Off Xmas: Urban Method Performance
Urban Method gets goofy with their performance of “You’re a Mean One, Mr. Grinch.”

Sing-Off Xmas: Shawn Stockman and Nota
Judge Shawn Stockman and Season 1 winners Nota perform “This Christmas.”

Sing-Off Xmas: The Collective
Season 2 winners Committed give their own rendition of “Santa Baby.”

Sing-Off Xmas: Dartmouth Aires
Season 3 silver medalists The Dartmouth Aires perform “All You Need Is Love.”

Sing-Off Xmas: Ensemble Performance
All 14 groups present come together for a performance of “Happy Christmas (War Is Over).”