“Man of Constant Sorrow” (also known as “I Am A Man of Constant Sorrow“) is a traditional American folk song first recorded by Dick Burnett, a partially blind fiddler from Kentucky. The song was originally recorded by Burnett as “Farewell Song” printed in a Richard Burnett songbook, circa 1913. An early version was recorded by Emry Arthur in 1928 (Vocalion Vo 5208). Public interest in the song was renewed after the release of the 2000 film O Brother, Where Art Thou?, as it plays a central role in the film’s plot.
by Emry Arthur
and a very good cover by the Gormans
World Music - the Music Journey 
Absolutely love this song, Stan! I have the special 2 disc version of the movie, which includes a live concert of all the ‘mountain music’ from the artists that recorded for the film, which took place in The Ryman auditorium in Nashville, a venue I visited in 2010. I recommend the concert!