Ron,

Emmylou's duet partner on Sin city is Beck, not Jeff Beck but just plain Beck. Seems he uses his given name in his musical life in the manner of Brazilian football (soccer) players. As for In My Hour Of Darkness, that's The Rolling Creekdippers which is a collective including Mark Olson, Victoria Williams, Buddy and Julie Miller,and Jim Lauderdale. No detail about who sings which parts but it sounds to me like they all take a turn except I don't hear Buddy Miller's voice in there. Maybe he was relegated to guitar duties only on that session and naturally nails it as usual.

Michael