A few more to look into...For Bluegrass:

Don Reno, The Osborne brothers, Larry Sparks, Mike Compton, Frank Wakefield, Country Current, Hot Rize, IIIrd Tyme Out, Seldom Scene, The Country Gentlemen, The Kentucky Colonels, Jackstraw, The Nashville Bluegrass Band...to name but a smattering.

For old time:

Tommey Jarrell, Fred Cockerham, Gid Tanner, Uncle Dave Macon, Any Old Time String Band, Fuzzy Mountain String Band, Freighthoppers, Tim O'brien, Dirk Powell, John Herrmann, Piney Creek Weasels, Middle Spunk Creek Boys...to name yet another few.

If you wish, I can direct you to .MP3 sites with all of these folks and a ton more.