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Pete Seeger and friends perform the classic "This Land Is Your Land" together on stage at Madison Square Garden for Pete Seeger's 90th Birthday Celebration. More performances: "We Shall Overcome" The Happy Birthday Song Joan Baez Performs "Where Have All the Flowers Gone"

Seeger's family, friends, fans, supporters, and the musicians influenced by his music sing "Happy Birthday" for Pete Seeger's landmark 90th birthday. More performances: "We Shall Overcome" Seeger and Friends Perform "This Land Is Your Land" Joan Baez Performs "Where Have All the Flowers Gone"