The singer-songwriter and social activist best known as one-third of the folk-music group Peter, Paul and Mary, has died at age 86.

Peter Yarrow – one-third of the beloved folk trio Peter, Paul, and Mary, whose anthems epitomized the 1960s protest movement – died Tuesday in New York.

Peter Yarrow, iconic folk singer-songwriter and member of Peter, Paul and Mary, has died at age 86 in New York. His group’s influence spanned the 1960s, winning five Grammys and performing at key moments in American history, including the 1963 March on Washington.