Just my opinion, but I think it would be a good idea to study and appreciate the early bluegrass artists and then move ahead to "2nd generation bluegrass", "3rd generation bluegrass" and even "newgrass", the last being more rock than traditional hill country music.

Bill Monroe recorded 28 songs for Columbia Records in 1946-7 with his "classic" lineup.

The Stanley Brothers recorded 22 songs from 1949-51, also for Columbia Records.

The CD I mentioned by Harley "Red" Allen is in the early tradition even though much later.

After that, check out the Country Gentlemen who are credited with starting "2nd generation bluegrass.

I think Tony Rice is one of the great talents in history but his baritone singing and guitar fireworks a far removed from the "high lonesome" sound of the early "true bluegrass".