What defines bluegrass music would have to be the banjo played “The Earl Scruggs Way” with the three-finger roll. If it’s played clawhammer style, it would have to be classified “Old Time.” Now, bluegrass music, as a genre, grew out of this. As to musicianship, the chief — Bill Monroe — said if you could play bluegrass music right you could play anything else. What I’ve found is that bluegrass music, like jazz, is built around tight timing. It’s not loose. If you understand that, you can apply it to other types of music.