The judges must choose whom to save - Calle Sol or the acoUstiKats.

Appearing:

Nick Lachey
Jewel
Ben Folds
Shawn Stockman
acoUstiKats
Calle Sol
Tags: The Sing-Off, Season 4, nick lachey, Jewel, Ben Folds, Shawn Stockman, a cappella, singing competition, Princeton Footnotes, VoicePlay, Ultimate Sing-Off, Elimination

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