Here's two more by Doc, the gospel song "You Must Come in at the Door," and "Dear Old Sunny South by the Sea."
Tony Rice is one of the greatest bluegrass guitarists ever. I understand he had some problems with drugs over the years but I saw a youtube of him playing great at Bonaroo in 2009 so he must be sober now. This youtube is older, back when he was in his prime. He's with his group The Tony Rice Unit and the song is "Tipper."