Bluegrass is VERY TRADITIONAL - sort of... Many of it's leading proponents do "other" songs in the bluegrass style, & they sound GREAT! A few yrs ago on PHC Robin & Linda Williams were doing some nominally comic bits, re-casting pop & broadway show tunes, etc, as bluegrass... Only thing was often they were really super, not comedic at all. One wag has - possibly correctly - described Bluegrass as "folk music in overdrive."When I started going to the local bluegrass jam, I mostly knew "folk." (Let's not try to define it, OK, or we'll be here YEARS!) So when my turn to sing came, and no favorite Gospel popped up (grew up catholic, so I only know a little Gosspel - all beautiful songs, but WE didn't sing "Protestant" songs in those days - I think they do now), I lit into a Tom Paxton number w/my usual - I thought - moderately fast finger-picking.
Well, the boys jumped right in! They not only knew the song, but played it at a thousand miles an hour; I could barely keep up! Turns out some of his stuff has made the transition to become Bluegrass standards. I understand leading 'Grasser's have recorded lots of Gordon Lightfoot material, for example. Some experiment w/blending jazz forms, (no doubt purists will dislike them for it).
And - listen to the words - there are a lot of great songs apparently accepted as "genuine bluegrass." The "high lonesome sound" can grow on you! Hang in there, get more exposure & I think you'll like it.
Cheers, BK