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Her accounts paint the songwriter as an endearingly hard worker who has devoted a large portion of her career to trying to make other people sound good — even though she’s established herself as a formidable performer in her own right. She explains that she usually receives “20 or 30 tracks a week” from producers who want her to write lyrics and melody over them for a particular performer. Two of the songs on This is Acting, “Reaper” and “Cheap Thrills,” are ones she worked on for Rihanna. Kanye shares a writing credit on “Reaper,” though Sia admits they never actually worked side-by-side on it.

“They’ll entice me into a session by saying, “Rihanna will definitely be there” or “Kanye will definitely be there,” she explains, “but it’s hilarious because I turn up and, almost always, they never come.”

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.”