The "Man of Constant Sorrow', Dan Tyminski is a 4 time IBMA bluegrass vocalist of the year, and a 14 time Grammy winner. From The Lonesome River Band, through 30 years with Alison Krauss and Union Station, and his award winning song from the movie Oh Brother Where Art Thou, Dan has been at the top of the bluegrass world as a singer, songwriter, and multi instrumentalist. Fascinating interview.