Paul McCartney has rocked everywhere from rooftops to David Letterman’s marquee, but his next project is far more delicate: He’s been asked to write music for a ballet. Not much is known about the ballet, including which company commissioned the Beatles great to write it. However, McCartney tells the BBC he jumped at the chance to take on a musical opportunity he hadn’t yet explored. "I’m interested in doing things I haven’t done before. 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," McCartney said. "I don’t really know that much about it yet. I’m just writing music for it, but it’s a switch!"