The Polish composer Krzysztof Penderecki is a pioneer of 20th century experimental music, developing new tonal scales and melodic structures in the 1960s.

Now he's collaborating with one of his biggest fans - Jonny Greenwood, guitarist with the band Radiohead, who's also forging a career as a classical composer. John Wilson, presenter of Radio 4's Front Row met them backstage at a joint concert at the Barbican in London.

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