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.