Rounder you said? Pfeh. Alison Krauss regularly gets airplay on CMT. (Although admittedly she was an unknown when I first heard of her more than a decade ago...and I liked her then.)

And if you don't know who Alison Krauss and Union Station are...well, one of the guys in Union Station, Dan Tyminski, was the singing voice of George Clooney in "O Brother Where Art Thou".

-uso.