It was a close one for the AcoUstiKats in the 2nd episode of NBC's "The Sing Off". With a "party anthems" challenge the AcoUstiKats sang Outkast's "Hey Ya". Their performance landed them in the bottom two, where they had to battle team Calle Sol in singing Kelly Clarkson's "Stronger".

Luckily the 'Kats made it through to the next round! Watch both performances here: