Music
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Speaking to BBC News, the ex-Beatle conceded that he is both inexperienced and oblivious about the performance he is being asked to pen.
"I'm interested in doing things I haven't done before," he said. "That offer came up and I love writing music, the two went together and I said, 'Yeah', so I just accept things before I even know what I'm doing.
"I don't really know that much about it yet. I'm just writing music for it, but it's a switch!"
More: Paul McCartney, Music
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