The song is rumored to be about Styles' ex-girlfriend Camille Rowe, who happens to be a fan of In Watermelon Sugar. They had the book, In Watermelon Sugar by Richard Brautigan and thought it would sound cool as the hook. They eventually started throwing around some ideas and came up with the repetitive chorus melody. They went into The Cave Studio in Nashville, Tennessee and started the session by just playing around. It was originally written in September 2017 while Styles was on a day off from Harry Styles: Live on Tour. 'Watermelon Sugar' was written by Styles, Mitch Rowland, and producers Tyler Johnson and Kid Harpoon. Styles has promoted the single with many live televised performances including on Saturday Night Live, Later. Directed by Bradley & Pablo and filmed in Malibu, California, it features Styles alongside a plethora of people dancing on the beach and eating watermelon.

The music video for 'Watermelon Sugar' was released on, which received many positive reviews. It won the 2021 Grammy Award for Best Pop Solo Performance, and also won Song of the Year at the 41st Brit Awards the same year. The single also performed well commercially, peaking within the top ten in more than 20 countries, including the United Kingdom, Australia, Canada, and the United States, where it became Styles' first number-one single on the Billboard Hot 100 chart. The song was generally well received by music critics. Originally released as a promotional single from Fine Line on 16 November 2019, 'Watermelon Sugar' was later released as the album's fourth single on. 'Watermelon Sugar' is a horn and guitar-driven funk- pop, rock, indie pop song.

They were inspired by the American novel In Watermelon Sugar (1968) by Richard Brautigan. Styles wrote the song with Mitch Rowland and the song's producers, Tyler Johnson and Kid Harpoon. ' Watermelon Sugar' is a song by English singer Harry Styles from his second studio album Fine Line (2019), included as the album's second track. For the Richard Brautigan novel, see In Watermelon Sugar.

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