Mary Travers of Peter, Paul and Mary, who has been battling leukaemia, will undergo a bone marrow transplant after finding a donor.
"We found a match - well, almost," Travers, 67, wrote in a posting on the trio's website. "Nine points out of 10. I hate to say this but it's close enough for folk music."
Travers had been waiting for a match after chemotherapy did not stop the disease.
"I want to share with all of you just how much your words of encouragement, your prayers and all of your good thoughts and wishes have meant to me," Travers wrote.
"The response that we have received on our website has been overwhelming."
Travers, who revealed her illness last year, is expected to have the operation soon, said publicist Heather Lylis.
Peter, Paul and Mary, known for songs such as Leaving on a Jet Plane and Puff, The Magic Dragon, last year released Carry It On, a five-disc box set of their greatest hits.
Travers finds bone marrow donor
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