I got a question for you: Peter, Paul and Mary was an American folk group formed in New York City in 1961, during the American folk music revival phenomenon. The trio was composed of tenor Peter Yarrow, baritone Noel Paul Stookey and alto Mary Travers. The group's repertoire included songs written by Yarrow and Stookey, as well as covers written by other folk musicians. After the death of Travers in 2009, Yarrow and Stookey continued to perform as a duo under their individual names.

Based on this passage, who wrote the songs for peter paul and mary?
Let's think first:
The relevant information to answer the above question is: The group's repertoire included songs written by Yarrow and Stookey, as well as covers written by other folk musicians.
Therefore, the answer is Yarrow and Stookey.