Roy Acuff (1903 to 1992). The fiddling Opry patriarch whose backing launched the Grand Master Fiddler Championship.
Why this player is listed
Roy Acuff 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.