Peter, Paul and Mary are best known for hit songs like If I Had a Hammer and Puff, The Magic Dragon.
Travers supported civil rights and anti-war movements and the group often performed at political rallies and protests.
After Peter, Paul and Mary disbanded in the early 1970s, Travers carried on as a solo artist and the trio also went on to reunite for benefits and other events.
Travers had undergone a bone marrow transplant and Associated Press had quoted her in 2006 as saying she was "feeling fabulous," however, her condition had worsened again by the summer of this year and she had become unable to perform.
Travers leaves behind a husband, Ethan Robbins and two daughters, Alicia and Erika who survive her.
