Question: What trio sang "Where have all the flowers gone"?

Answer: Peter, Paul and Mary

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Peter Yarrow, Paul Stookey, and Mary Travers started as a trio in 1961. They signed with Warner Brothers and released their first album in 1962. They are known for their folk songs with a message. They remained together, remained with Warner Brothers, and continued to produce music and tour into the twenty-first century.

Mary Travers passed away 1n 2009. Ars Longa, vita brevis.