Country Joe McDonald, singer for the psychedelic-folk band Country Joe and the Fish and songwriter of the anti-Vietnam War anthem “I-Feel-Like-I’m-Fixin’-to-Die Rag,” died Saturday at the age of 84.

Country Joe McDonald, a musician who performed at the Woodstock festival and led the psychedelic-folk band Country Joe and the Fish, has died.

For many Americans, McDonald's place in music history was sealed on a muddy August afternoon in 1969, when he walked alone onto the Woodstock stage and led an estimated 400,000 people through his noto...