Sir Paul McCartney is to premiere his first ballet score after collaborating with an esteemed US company.
Although the former Beatles star has worked on a number of classical works, including his Liverpool Oratorio, it marks the first time he has written an original orchestral score for dance.
Sir Paul said: "What was interesting was writing music that meant something expressively rather than just writing a song - trying to write something that expressed an emotion. So you have fear, love, anger, sadness to play with, and I found that exciting and challenging."
The work, named Ocean's Kingdom, will be given its first performance by the New York City Ballet on September 22 at its autumn gala.
Sir Paul is moving from Blackbird to Black Swan after meeting the company's ballet master in chief, Peter Martins, last year. The pair met at the School of American Ballet's winter gala.
The former Beatle said: "I am always interested in new directions that I haven't worked in before, so I became very excited about the idea.
"When I got back to England after meeting Peter I started writing music and am now in the very final stages of the orchestral score."
Further details of the production will be announced later in the year.
Peter said: "After I got to know him a bit, and knowing of his great love of composing classical music, I asked if he might be interested in doing something for New York City Ballet, and I am ecstatic that he has agreed to write a score for us."
Sir Paul's first orchestral work, a collaboration with Carl Davis called Liverpool Oratorio, was first heard in 1991. Since then he has released Standing Stone, Working Classical and Ecce Cor Meum.