On his very early sessions in 1925 and 1926, Lonnie Johnson played fiddle frequently, and it's as tasty as you would expect. Another guitar hero who also played fiddle occasionally is Big Bill Broonzy--he actually played fiddle long before he learned guitar. There's a nice version (two takes) of CC Rider on the JSP All The Classic Sides 1928-1937 box set. On the same CD Bill plays guitar on six cuts with a group called the State Street Boys (including Black Bob and Jazz Gillum), with a fiddler named Zeb Wright, who I haven't been able to find out anything about. Nice stuff though.