Love Muleskinner tostado! Rockadanny, Chris Hillman’s solo albums on Sugar Hill are fantastic too, as is his Country group with Herb Pedersen and John Jorgenson, The Desert Rose Band.
Here’s a warning, of a sort: There are two main strains of Bluegrass, Traditional and Progressive. Traditional is "song-based"---singers accompanied by instrumentalists. Progressive Bluegrass is akin to Progressive Rock, mostly instrumental music featuring a lot of soloing. There is a Progressive Bluegrass band named Psychograss, whose "A-list" members include a bass player who was in the same Pop Group (!) as I in ’71, Todd Phillips. I was just joining the group as he was leaving, going up to Marin County to study mandolin with David Grisman. Dave told him there was a shortage of Bluegrass bass players, that he should learn to play stand-up (acoustic) bass. Todd took his advice, and carved out a nice little career for himself. He’s was touring with Joan Baez last I heard. I got myself a Psychograss album, and hated it! Traditional Bluegrass si, Progressive no, for me at least.
Anyway, the point is that not all Bluegrass is the same, anymore than The Beatles are the same as, say, King Crimson. I just went and saw Jerry Douglas, master Dobro player (Alison Krauss, Nashville 1st call recording), whose playing as an accompanist I love to death. Wouldn’t ya know it, solo (with a 4-piece band) he plays Progressive Bluegrass!