+ Doc Watson, Roscoe Holcomb, Clarence Ashley, Tommy Jarrell & Fred Cockerham... lots of great stuff. Living in Kentucky introduced me to some great bluegrass. I've never been able to get into this type of folk music as much as Faheyian folk-raga, though.
Holcomb and Watson are both more in the old time string band tradition though. There's a pretty distinct difference between the mountain music traditions of Watson (Wilkes Co., NC), Holcomb (east KY), Jean Ritchie (also east KY), Riley Puckett, Gid Tanner (both N. Georgia), Kelly Harrell, the Carter Family (both from SW VA) and the various string bands from the NC mountains (mostly Ashe, Watauga, Mitchell and Avery counties) and bluegrass, which emerged from the foothills regions of Kentucky, Tennessee and North Carolina.
Old Time is, for the most part, a more authentic tradition with a stronger connection to the English, Celtic and Scandinavian traditions from which it emerged, while bluegrass is definitely a product of recorded music (and was, in essence, the 'country' music response to bebop).
When I get time, I'll put some of this stuff up. I tried to make a Jean Ritchie album available a few months ago, but the link was disabled within a matter of hours.