Sia has a new album coming out in January, This Is Acting, which entirely features songs she originally wrote for other A-listers, but were ultimately rejected. She spoke to Rolling Stone about the process of recycling could-be hit songs for other people into an entire album for herself, and what working with people like Rihanna, Kanye, Katy Perry, Adele and Beyonce is like from her own refreshingly humble perspective.

“Not true of artists like Beyonce, with whom Sia says collaborating is “like a writing camp” and that “she’s very Frankenstein when she comes to the songs,” taking bits and pieces from various songwriters and asking to hear them mixed together. “In the end, she had maybe 25 songs of mine on hold, and I was very excited to get a couple of them back. Definitely one is on the album.”

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