Martin has co-written and co-produced 73 US Top 10 singles for the likes of Taylor Swift, Ariana Grande, Katy Perry and Britney Spears. Twenty-two went to No 1, with 12 also topping the UK charts. Collectively, these have sold more than 150m copies globally, earning Martin an Oscar nomination, five Grammys and the 2016 Polar Music prize (previously won by Bob Dylan and Patti Smith). Martin’s 22 US No 1s make him the third-most successful songwriter in US chart history, behind only Paul McCartney (32) and John Lennon (26).

The question remains: would you even recognize the guy if you crossed paths on the street?

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