September 16, 2009 at 12:00 PM EDT

Mary Travers, who was a member of the popular ’60 folk trio Peter, Paul and Mary, died Wednesday in Danbury, Conn., after a battle with leukemia, her spokeswoman confirmed. She was 72. The Grammy-winning politically active group, known for its glorious three-part harmonies, boasted a string of hits including  “If I Had A Hammer,” “Lemon Tree”, “Puff (The Magic Dragon)”, and “Leaving on a Jet Plane.” After Peter, Paul and Mary disbanded in 1971, the singer recorded five solo albums before reforming the band with Peter Yarrow and Noel Paul Stookey. After being diagnosed with leukemia in 2004, she underwent a bone marrow transplant.

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