From the names you gave, I am guessing that you have this from one of the Emmylou Harris albums that it is on ~~ I think that is the way they are given in the credits. They are usually known as Doyle Lawson, Charlie Waller, and Bill Yates, members of the Country Gentlemen when they recorded this in 1977. I am sure the song is much older, as they only took credit for the arrangement. This link will take you to a site that gives you the lyrics and chords as sung by ELH!