Singer-guitarist Roger McGuinn, best known as leader of The Byrds, is a folk-rock pioneer. Since the group disbanded, McGuinn has pursued a solo career, and also created the Folk Den Project, an online database of traditional songs he records.
https://www.npr.org/2012/04/18/150890766/the-byrds-roger-mcguinn-works-to-preserve-folk?ft=1&f=5