Sam Andrew Gumbley (born 4 August 1992), known professionally as S-X, is a British singer, songwriter, and record producer. As a producer, Gumbley has worked with many high-profile artists like Lil Wayne, Childish Gambino, Chance the Rapper, J. Cole, T.I., Meek Mill, Tyga, Nicki Minaj, Future and KSI, and he was Grammy-nominated for his work on Childish Gambino's album Because the Internet (2013). Gumbley gained mainstream popularity as a singer when he featured on KSI's 2019 single "Down Like That", alongside Rick Ross and Lil Baby, which peaked at number 10 on the UK Singles Chart.

The name “S-X” stands for Sam, which is his real name, and “whatever”. The X in his name can mean or be anything, just like a variable. This was explained by the artist on his Instagram live feed on the 2nd of June 2018.
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