“Drunken Hiccups” from Tommy Jarrell, in aAEAC# (well, tuned down a little), the banjo equivalent of Calico tuning on the fiddle. This tuning and aAEAE are great for a lot of cross-tuned fiddle tunes.
This one also goes by “Rye Whiskey”, “Clinch Mountain” and various other names. Lots of great recordings around: Hobart Smith, Elmo Newcomer and Bill Stepp and Frank Proffitt are some of my favorites.
Don Borchelt has a great video up too of his playing it on his partially fretless banjo in the same tuning.