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"Sad Day" (stylised in all lowercase) is a song by English singer FKA Twigs. Released on 9 November 2019 by Young Turks, it serves as the fourth and final single from Twigs' second studio album, Magdalene. The song was written and produced by Twigs, Koreless, Benny Blanco, Cashmere Cat, Nicolas Jaar, Skrillex and Noah Goldstein.