Leslie West, known best as the frontman and guitarist for rock band Mountain, died on Tuesday. He was 75 years old.

West’s publicist confirmed his death to the L.A. Times, saying the musician’s cause of death was cardiac arrest.

Mountain formed on Long Island, New York in 1969 and released three albums before they broke up in 1972 — though they’ve reunited frequently since and released a number of other projects including 1974’s Avalanche, 1985’s Go for Your Life, 1996’s Man’s World, 2002’s Mystic Fire and 2007’s Masters of War. The group notably performed at Woodstock in 1969.

A version of this story first appeared on Billboard.com

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