NBC shared this trailer of 'The Sound of Music,' which will air live Dec. 5.

How will Carrie Underwood fare as Maria in a live telecast of "The Sound of Music"?

That mystery propels the most unusual program this week: NBC's live telecast of the Rodgers and Hammerstein musical at 8 p.m. Thursday. The producers stress that they're presenting the Broadway musical from 1959, not remaking the Julie Andrews movie from 1965. The cast includes familiar TV faces: Stephen Moyer ("True Blood") as Capt. Von Trapp, Audra McDonald ("Private Practice") as the Mother Abbess, Christian Borle ("Smash") as Max and Laura Benanti ("Go On") as Elsa.

The other networks on Thursday will counter with new episodes of "The Big Bang Theory," "Grey's Anatomy," "Scandal," "Elementary," "The Vampire Diaries," "Glee" and "The X Factor."

But first the six final acts on "The X Factor" must perform at 8 p.m. Wednesday on Fox. Alex & Sierra, the duo from Central Florida, are still in it, and mentor Simon Cowell has praised the pair's originality. The singing contest will name its winner Dec. 19.

"The Voice" announces its victor Dec. 17. This week, the top six acts sing at 8 p.m. Monday. The results episode at 9 p.m. Tuesday will feature Kelly Clarkson singing "Underneath the Tree" and Blake Shelton joining Xenia on "Silver Bells."

Now that "Dancing With the Stars" has concluded its season, ABC will fill Monday with holiday cheer. The beloved "Charlie Brown Christmas" airs at 8 p.m. Jennifer Nettles hosts "CMA Country Christmas" at 9 p.m. The performers include Kellie Pickler, Mary J. Blige, Trace Adkins, Luke Bryan, Hunter Hayes, Sheryl Crow, Darius Rucker, Rascal Flatts and Willie Robertson of "Duck Dynasty."

"Christmas in Rockefeller Center" will feature that tree lighting at 8 p.m. Wednesday on NBC. There will be performances by Kelly Clarkson, Mary J. Blige, Mariah Carey, Toni Braxton, Ariana Grande, Kenny "Babyface" Edmonds, Jewel and Goo Goo Dolls.

TNT rolls out the six-hour "Mob City" in two-hour chunks at 9 p.m. Wednesdays, starting this week. The style overwhelms the drama in this gangster story from Frank Darabont ("The Walking Dead"), but the strong cast includes Jon Bernthal, Jeffrey DeMunn and Neal McDonough.

Kirstie Alley plays a Broadway diva in "Kirstie," a sitcom debuting at 10 p.m. Wednesday on TV Land. Michael Richards portrays her driver, and Rhea Perlman plays the star's assistant. TV Land presents the pilot, then a second episode at 10:30 with Kristin Chenoweth as Alley's calculating understudy.

LL Cool J hosts "The Grammy Nominations Concert Live!" at 10 p.m. Friday on CBS. Scheduled to perform are Drake, Robin Thicke, Keith Urban and Macklemore and Ryan Lewis.