Sia Performs 'Elastic Heart' on The Voice

Sia has proven time and again that she's not only one of the best songwriters around, she's also a killer performer. Case-in-point, last night she floored The Voice's audience with a rendition of her 2014 hit, "Elastic Heart." No backup dancers, no backup vocalists, just a stage, a microphone, and the most fabulous blonde wig I've seen in a minute. All by her lonesome, she brought the house down and that's not nothing.