who sings man of constant sorrow o brother where art thou
O Brother, Where Art Thou? (soundtrack) "I Am a Man of Constant Sorrow" has five variations: two are used in the film, one in the music video, and two in the soundtrack. Two of the variations feature the verses being sung back-to-back, and the other three variations feature additional music between each verse.[8] The voices of the Soggy Bottom Boys were provided by Dan Tyminski (lead vocal on "I Am a Man of Constant Sorrow"), Nashville songwriter Harley Allen, and the Nashville Bluegrass Band's Pat Enright.[9]