Just one night of battle rounds remain on Season 4 of The Voice.

And these match-ups will be pretty much do or die for the singers in terms of the competition.

Only one save remains, meaning the loser in five of the six battles will automatically go home.

Among the contestants yet to compete are the Morgan Twins -- Cara and Rhian -- of Team Blake.

They'll try to continue the success of Midas Whale and the Swon Brothers, the first two duets to ever advance beyond the battle rounds on the show.

Follow the links below and you'll find profiles and pre-show music for the contestants to be featured tonight.

Team Adam

Agina Alvarez

Amy Whitcomb

Duncan Kamakana

Sarah Simmons

Team Blake

Justin Rivers

The Morgan Twins

Team Shakira