For anyone interested,I've run across this bit of information.
Alison Krauss,Emmylou Harris & Gillian Welch, will be performing on "The late show with David Letterman" tonight, Tues,Feb 27,at 11:35 pm EST.
They will perform,"Didn't leave nobody but the baby",From the sound track of "Brother Where Art Thou".
Also performing will be Dan Tyminski,doing,"Man Of Constant Sorrow".

Hope this info is correct.

Ron.