Greg Lake, co-founder of two prog rock giants — King Crimson and Emerson, Lake & Palmer — died yesterday after a lengthy battle with cancer, according to his manager. He was 69.

Lake’s manager Stewart Young posted to Lake’s official Facebook page today that the musician passed away on December 7, 2016 after “a long and stubborn battle with cancer.” The news comes just nine months after the death of Lake’s former ELP bandmate Keith Emerson.

Keith Emerson, large proponent in ushering in the prog rock sounds of the late 1960s with the legendary Emerson, Lake and Palmer, died on Friday at his home in Santa Monica, CA, according to a post by ELP on their official Facebook page. He was 71.

Undoubtedly a trailblazer of the Hammond and Moog keyboards, Keith Emerson and ELP created sounds which at once borrowed from a sort of blues/rock foundation with multilayered complex arrangements on top, and even mixed with a quasi-Classical feel to boot.