Woodsongs Acoustic Archive woodsongs.com
some samples found from the above post link:
Punch Brothers and The Chapin Sisters
Gene Watson & Rhonda Vincent
Peter Rowan Bluegrass Band and Raymond McLain
Tift Merritt and Dangermuffin
Mark O'Connor & The Appalachia Waltz Trio and special surprise guest Tommy Emmanuel
Celebration of Appalachia & Mountain Music featuring Emmylou Harris, Darrell Scott, John & Patricia Adams, Nikky Finney with Sue Massek, & Madison Glover - Part 1