If you know this song from, "The Andy Griffith Show" then you've heard Charlene Darling AKA Maggie Peterson sing it. Since the female voice is usually pitched higher than a male voice the Dillards played this tune in Bm instead of the original Dm. Time to make Pa cry and play this one in the key of Bm!
There's a bunch of licks here. You can learn one or two to add some variation to the basic melody, or you can add in a bunch to create completely new arrangements that are based on the original melody.