The Sing-Off - Perfect - Extended Preview

The Sing-Off contestants collaborate for a spectacular performance of 'Perfect'.

I love this show! We've been following The Sing-Off since Season One -- and it has been amazing for the past two seasons! We still have videos of Season One and Two here.

Watch the extended preview of Season 3 here:

http://www.nbc.com/assets/video/widget/widget.html?vid=1352023