Is that one true Rick? Gawd knows the high part is true enough. Just saw the "Brother" thing and the movie for me was pretty thin. Mediocre is generous, but the music was fine.
BTW, I wasn't happy about the choice of "invented" here either as most music and instruments have a basis and a background before they became whatever. I think though that the actual point at which most take the shape we know now is often hard to determine. Bluegrass sound, regardless of what it was called whenever, came with the scenario described above. That doesn't take away from all those before of the additions afterward, but the starting/coming together point is pretty clear.