I always figured that's part of why Tony Rice plays so much Lightfoot--his songs are almost a precursor of "newgrass" style and give a fancy picker like Rice a nice palette to work from....

Also, chords with no third kind of define "Celtic" style, or modal if you like, since its the third that defines whether a chord is major or minor. Leave it out and it's neither, or either.

Ennnnh, what am I doing giving Rick advice? Maybe he can give me some:

Rick, how can one make a living playing music?

Bill
old enough to know better, still young enough to try