I'm totally loving this new track from Sia. It packs such a vibrant new sound. The song will give you a jolt of energy every time she kicks into the chorus. It sounds like the Aussie singer has something good to celebrate and is in a really good place. You can just tell from this track. "You've Changed" is taken from her 2010 record, "We Are Born," which was produced by The Bird & The Bee's Greg Kurstin. Sia sure sounds like reborn. Refreshed and reinvigorated. You gotta love.