Episode 1 (December 9, 2013) • Theme: Contestants' choice • Group Performance: "
Some Nights", "
We Are Young", and "
Carry On" by
fun. Episode 2 (December 11, 2013) • Theme: Party Anthems • Group Performance: "
Let's Get It Started" by
The Black Eyed Peas, "
Die Young" by
Ke$ha and "
Don't Stop the Music" by
Rihanna.
Episode 3 (December 12, 2013) • Theme: #1 Hits • Group Performance: "
In Your Eyes" by
Peter Gabriel.
Episode 4 (December 16, 2013) • Theme: My Generation • Group Performance: "
My Generation" by
The Who, "
We Will Rock You" by
Queen, and "
It's Time" by
Imagine Dragons.
Episode 5 (December 18, 2013) • Theme: Movie Night • Group Performance: "
(I've Had) The Time of My Life" from the film
Dirty Dancing. • In this episode every group competes in the Ultimate Sing-Off Challenge by default.
Episode 6 (December 19, 2013) • Theme: Judges' Choice • Group Performance: "
Shake It Out" by
Florence and the Machine.
Episode 7 (December 23, 2013) • Group Performance including all groups from Season 4: "
Man in the Mirror" by
Michael Jackson. •
Nick Lachey and
Jewel sang "
It Had to Be You" to each other at the beginning of the episode. •
Pentatonix (season 3 winners) performed "
I Need Your Love" by
Calvin Harris feat.
Ellie Goulding. •
98 Degrees performed "
I'll Be Home for Christmas" ==Ratings==