@dayglow:
"Many need to dig deeper in there collection and discover other artists"
+1
". . . you would think Miles Davis is the only competent jazz musician".
. . . or that the (relatively) light-weight Patricia Barber and Diana Krall are the only worthwhile female vocalists. People have no idea what they're missing.
I've learned this is one of those situations where the "lead a horse to water" analogy applies. You can't force another person to be artistically curious.
I'm in no way suggesting my personal tastes are in any way superior to anyone else's -- each person has to discover on their own what they like. But this cannot and will not occur without effort. Commercial radio will not drop it in one's lap. Instead, try Spotify, The Penguin Jazz Guide, YouTube, No Depression, the All Music site, etc. depending upon the genre of interest.
"...the same recordings are being played over and over Bowie/CCR/Dylan/Fleetwood Mac and Dire Straits etc."
As has been mentioned before on other threads, Classic Rock fans seeking fresher sounds should explore Americana.