VIDEO: Sia Performs 'Elastic Heart' on NBC's THE VOICE

Sia took the stage on last night's THE VOICE on NBC to perform her hit single, "Elastic Heart". Check out the appearance below!

About the show:

"The Voice" returns with the strongest vocalists from across the country invited to compete in the blockbuster vocal competition show's eighth season. Internationally acclaimed artist Christina Aguilera returns to join megastars Pharrell Williams, Adam Levine and Blake Shelton as celebrity musician coaches, while Carson Daly continues to serve as host.

The show's innovative format features five stages of competition: the first begins with the Blind Auditions, followed by the Battle Rounds, the Knockouts, the Live Playoffs and finally, the Live Performance Shows.

During the Blind Auditions, the decisions from the musician coaches are based solely on voice and not on looks. The coaches hear the artists perform, but they don't get to see them - thanks to rotating chairs. If a coach is impressed by the artist's voice, he/she pushes a button to select the artist for his/her team. At this point, the coach's chair will swivel so that he/she can face the artist he/she has selected. If more than one coach pushes his/her button, the power then shifts to the artists to choose which coach they want to work with. If no coach pushes his/her button, the artist is eliminated from the competition.

Once the teams are set, the battle is on. Coaches dedicate themselves to developing their team of artists, giving them advice and sharing the secrets of their success, along with help from their celebrity advisers. During the Battle Rounds, the coaches pit two of their own team members against each other to sing the same song together in front of a studio audience. After the vocal battle, the coach must choose which of his/her singers will advance to the next round of competition, while the losing artist is available to be stolen by another coach. Each coach has two steals available during the Battle Rounds.

Photo: Dana Edelson/NBC

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