Tony Rice did a few Lightfoot tunes. "Cold on the Shoulder" and "I'm not Sayin'" to name two.

Learn all the Monroe and Flatt/Scruggs rep. There really isn't much more you need. At some point, you begin to make your own versions of tunes. It just happens. Everybody else has. If this is viewed as purist crap, so be it. Everyone in Bluegrass is spawned by Bill...