The intensity of Boucher’s musical obsessions can make her seem like a mad pop scientist. On her bustling Tumblr page, she keeps track of her research into a cultural universe that seems, like its physical counterpart, to be expanding at an increasing rate. Her followers might encounter a snippet from the Japanese soundtrack composer Yoko Kanno, or a fan-made video set to the music of the electronic producer Aphex Twin, or a recent Selena Gomez single—which, Boucher has discovered, sounds particularly arresting in a car equipped with subwoofers. In her own songs, Boucher takes delight in rewriting the old music-industry story of the female performer in the spotlight and the male mastermind behind the curtain. “It’s like I’m Phil Spector, and then there’s Grimes, which is the girl group,” she says.