February 17, 2020 - A composition by Coldplay frontman Chris Martin recorded when he was just 12 went up for sale after being discovered by a schoolmate.
The cassette featured the star - then a pupil at Exeter Cathedral School - on the keyboard.
His three-minute track, which he composed and called Electric Thunder, won a music competition at the school.
Simon Corser, who was selling the tape, also entered the 1989 competition but lost to his schoolmate.
It sold for £1,700.
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