I agree,too, now there is more than enough Klezmer and Celtic !
The style of the following artists is (my opinion !) very interesting and absolutly not present:
Jim Croce; Leadbelly; Kansas Joe McCoy; John Lee Hooker; JJ Cale !
Leo Kottke !; Muddy Waters and Doc Watson (?). They are all good guitar-players and playable for Brent !