Robert Fripp is an English musician, composer, record producer, and author, best known as the guitarist, founder and only constant member of the progressive rock band King Crimson. He has worked extensively as a session musician and collaborator, notably with David Bowie, Blondie, Brian Eno, Peter Gabriel, Peter Hammill, Daryl Hall, the Roches, Talking Heads, and David Sylvian. He also composed the startup sound of Windows Vista, in collaboration with Tucker Martine and Steve Ball. His discography includes contributions to more than 700 official releases.