Vassar Clements (1928 to 2005). The father of hillbilly jazz. Monroe alumnus, Old and In the Way member, and a genre unto himself.
Why this player is listed
Vassar Clements appears in the Play Bluegrass guide to notable fiddle players, which collects contest champions, bluegrass fiddlers, Canadian fiddlers, judges, and departed legends tied to the tradition.
More fiddle context
For the larger list, start with the big list of fiddle players. For the style itself, read the guide to bluegrass fiddle.