For the full list of folk musicians look here. Some of those below will be on the folk list, but have become known for music outside the folk sphere

The Batish Family
Cream at the Marquee Club, August 1966
Bob Dylan
Julie Felix
Sarah Francis, oboist, 1979
Ron Geesin
Gordon Giltrap
Roy Harper
Alexis Korner
David Lindup, composer and arranger of many film and television scores, 1965. He died in 1992
Mike Oldfield
Gerry Rafferty
Composer and entertainer Donald Swann with his daughter Natasha, London 1981
Lloyd Ultan, American composer, Chairman and Professor of composition and music theory at the University of Minnesota School of Music, at his home in Minneapolis in 1978