By Dave Karger
Updated November 21, 2011 at 03:19 PM EST


On tonight’s episode of The Sing-Off (airing on NBC at 8pm/7pm Central), the final four groups will battle it out for a slot in next week’s finale. Groups will sing mash-ups of two lyrically related songs followed by a judges’ choice number. Check out the set list below:


Pentatonix: “Forget You,” Cee-Lo Green vs. “Since U Been Gone,” Kelly Clarkson

Urban Method: “Hot in Herre,” Nelly vs. “Fever,” Peggy Lee

Afro-Blue: “I Believe I Can Fly,” R. Kelly vs. “Fly,” Nicki Minaj & Rihanna

Dartmouth Aires: “Born This Way,” Lady Gaga vs. “Sympathy for the Devil,” The Rolling Stones


Pentatonix: “Dog Days Are Over,” Florence + the Machine

Urban Method: “All of the Lights,” Kanye West

Afro-Blue: “A Change Is Gonna Come,” Sam Cooke

Dartmouth Aires: “Shout,” The Isley Brothers

I’m rooting for Pentatonix, Dartmouth Aires, and Afr0-Blue to make the finale. How about you?

Dave on Twitter: @davekarger