In the Summertime was written by Ray Dorset and released by British band Mungo Jerry in 1970 as their debut single. Its simple skiffle-inspired sound helped it top the UK chart and become a major international hit during that summer, turning it into the band's signature song. Decades later it remains a shorthand for warm weather and carefree holidays, regularly revived in films, advertisements, compilations and social videos whenever creators want an instantly familiar summer feeling.