Robert Fripp (born 16 May 1946) is an English guitarist, composer and record producer. Best known as guitarist for the progressive rock band King Crimson, Fripp has been the only member to play with the band since its inception in the late 1960s. He has also worked extensively as a studio musician and collaborator, notably with David Bowie, Brian Eno, and David Sylvian. He has also contributed sounds to the Windows Vista operating system. His complete discography lists more than seven hundred releases over five decades.He is ranked 62nd on Rolling Stone magazine's 2011 list of the 100 Greatest Guitarists of All Time after having been ranked by David Fricke 42nd on its 2003 list. Tied with Andrés Segovia, he also is ranked 47th on Gibson's Top 50 guitarists of all time. His compositions often feature unusual time signatures, which have been influenced by classical and folk traditions. His innovations include Frippertronics, "soundscapes", and new standard tuning.