Rock 'n Roll Hall of Fame singer and guitarist Roger McGuinn, best known as the front man for The Byrds, is considered a pioneer of folk rock. The band blended traditional folk songs with a rock beat and scored major hits in the 1960's including "Turn, Turn, Turn" and "Mr. Tambourine Man."
The Byrds disbanded in 1973, and McGuinn pursued a solo career, performing acoustically and returning to his folk roots.
In 1995, he created the Folk Den Project, an online series to store traditional folk songs that he records once a month. NPR's Neal Conan talks with McGuinn about The Byrds and his solo career, and about his work preserving folk music. (NPR)
30 Minute Interview
The Byrds' Roger McGuinn Works To Preserve Folk (NPR).mp3
There is probably over 200 folk songs you can download for free on the Folk Den site.