No backgrounds, no lip-synch, no instruments- just pure voices filling the stage on NBC’s hit show “The Sing-Off.”

The a capella contest rocked TV’s across America last night as 16 new groups performed pop songs like never before during the 3^rd season premiere.

This year, these groups began their journey, vying for $200,00 and a Sony Music recording contract:

• Afro-Blue

• Dartmouth Aires

• Delilah

• Fannin Family

• Kinfolk 9

• Messiah's Men

• North Shore

• Pentatonix

• Sonos

• Soul'd Out

• The Cat's Pajamas

• The Collective

• University of Delaware Deltones

• University of Rochester YellowJackets

• Urban Method

• Vocal Point

Spoiler Alert (if you didn't catch Monday night's performance), the two groups to sing their Swan Song were the Fannin Family and The Cat's Pajamas.

You can find clips from the show and more about the contestants by clicking here.

Did you watch Monday night’s performance?  What was your favorite group? Who do you think will win? Tell us in the comment section below or on the NBC25 Facebook Page.