Sia tells Ellen how the song ended up on ‘This Is Acting.’

Sia swings by Ellen to perform This Is Acting track “Bird Set Free.’

Another day another oversized bow. After her magical performance, Sia opens up about how her entire album came to be – a collection of rejected songs from artists like Rihanna, Adele, Kanye West and more. She explains how “Bird Set Free” landed on the LP which hit No. 1 on iTunes almost immediately after its debut last Friday.

“Well here’s the thing, that one I wrote and I loved it,” she explains. “I wrote it for Pitch Perfect 2 the movie, but they ended up taking a song called ‘Flashlight.’ So then I pitched it to Rihanna, then Rihanna took that one. Then Adele heard it and Adele cut it. And then Adele gave it back to me, and I was grateful because I had seller’s remorse.”

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