Robert Fripp (born 16 May 1946) is an English musician, songwriter, record producer, and author, best known as the guitarist, founder and longest-lasting 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, Daryl Hall, The Roches, Talking Heads, and David Sylvian. He also composed the startup sound of Windows Vista operating system, in collaboration with Tucker Martine and Steve Ball. His discography includes contributions to over 700 official releases. His compositions often feature unusual asymmetric rhythms, influenced by classical and folk traditions. His innovations include a tape delay system known as Frippertronics and new standard tuning.