Not necessary. If you know bluegrass, then you know. To humor you a little: Down by the Ohio, Willie kills Polly--in fact, Willie kills Polly in so many songs that there's a bumpersticker that says, "Polly, don't go down to the river with Willie." Little Sadie, "Went out last night, to take a little round, I met Little Sadie and I shot her down." Just look at the roster for the fair and count the bluegrass bands. I have friends in all of them.