Well tonight’s the night @ 8 P.M. on NBC’s The Sing Off the final Four will give the most important performances of their lives as they try to make it to the finals.  Tonight each group will be performing mashups of two songs into one…and in the second hour they’ll be performing judges choices- we can expect an insane night of awesome A Capella.

Last time I posted about Pentatonix (PTX) I ended with a vid of their most recent performance Let’s Get It On..tonight I just thought I’d share their first performance and group introduction from their very first spot on The Sing Off.

So here are PTX Performing E.T. by Katy Perry.

GO PTX!

Ross Out

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