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Musician Greg Lake, a progressive rock pioneer known for elaborate concerts, lengthy tracks and classical influences, has died at the age of 69.

FOX's Jacquelyn Karl reports:

Greg Lake's manager, Stewart Young, saying Lake died Wednesday after "a long and stubborn battle with cancer."

Born in the Southern English seaside town of Poole in 1947, Lake founded King Crimson with guitarist Robert Fripp in the late 1960's.

The band pioneering the genre that came to be known as progressive rock:

(Emerson, Lake & Palmer) "Welcome back my friends to the show that never ends."

Lead singer Lake went on to form ELP with keyboardist Keith Emerson and drummer Carl Palmer. The band released six platinum-selling albums, including 1973's "Brain Salad Surgery."

ELP broke up in 1979, reunited in 1991, disbanded again and reunited for a 2010 tour.

Jacquelyn Karl, FOX News.

Follow Jacquelyn Karl on Twitter: @Jacquelyn_Karl