Scotty Stoneman (1932 to 1973). The wild man of bluegrass fiddle, from the Stoneman Family and the Kentucky Colonels. His live recordings still sound dangerous.
Why this player is listed
Scotty Stoneman 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.