Shape Of You was the world's best-selling song of 2017, with more than three billion plays on Spotify alone
However, they differed on whether Sheeran had copied his song from Sami Switch, whose real name is Sami Chokri, and his co-writer Ross O'Donoghue.
He wrote that "the overall design and musical development of the melodic, harmonic and lyrical content in the relevant phrase in Shape Of You are distinctively different from that utilised in Oh Why". Mr Ricigliano agreed, paraphrasing a quote from West Side Story composer Leonard Bernstein: "The pentatonic scale is humanity's favourite scale and is so well known that one can find examples of it from all corners of the Earth".
Mr Siddell, who was instructed by Mr Chokri's lawyers, disagreed, saying the similarities between the two songs were "so numerous and striking that the possibility of independent creation is… highly improbable".
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