Grimes and Charli xcx have publicly pieced together memories of an unreleased song called "Witch v Witch" after a fan posted a clip of the track online, sourced from a video of unclear origin. The exchange, which played out on X over roughly 24 hours, highlights how much unreleased material exists from both hyperpop-adjacent pop stars and how social media can resurface long-forgotten collaborations even the artists themselves struggle to recall.

The saga began when a fan shared a jackhammer-beat hyperpop track featuring a distorted chorus and a voice resembling Charli's singing lyrics about secrets and closeness. Charli xcx first suggested she thought it was her with Grimes, and Grimes later confirmed hazily remembering writing it, though she couldn't recall the session's time or place, speculating that producer A.G. Cook may have later reworked her original production. Charli then agreed, recalling they worked together at Grimes's LA home "a long time ago." Neither artist's team responded to requests for comment, and the update comes as Grimes teases her sixth album, Psy Opera, and Charli continues promoting her recent album Music, Fashion, Film.