Freight Hoppers (original lineup) play Sugar Hill.
Key of D usually. Two high parts, two low parts. It can go to relative minor (that is Bm from key of D).
The definitive version was created by Tommy Jarrell on fiddle. There are many field recordings of him. We have a CD called June Apple; Jarrell fiddles and sings while Kyle Kreed banjos. On-line, check out the Miliner-Koken collection at slippery hill [mp3]. There is a clip on-line for this Smithsonian compilation CD.
We have this tune played slow and fast on Bruce Molsky's CD, Southern Old-Time Fiddle tour. Molsky's liner notes explain he learned to play it in the downbow style from Tommy Jarrell. He tunes the bottom string up to A for drone. He says Tommy sang and improvised on the second (low) part which he repeated 1 to 4 times, no telling.
This is a hoot! Ryan Thomson and Last Chance [utoob].
Another great recording by Brian Scott [utoob], solo fretless banjo.
Kirk Sutphin (interviewed by David Holt) plays Fred Cocherham's version on formica top fretless banjo. [utoob, skip to 1:50].
Slow, medium, fast fiddle at Old Town School.
Slow, medium on Matt Brown's instructional CD [CDbaby].
Back to back fiddle+banjo duet [utoob]
Royalty free sheet music, key of D. No minor chord.
Paul Brown & John Schwab in a white tent at Clifftop 2013 [utoob].
All Day Breakfast Stringband [bandcamp] of Montreal with WV fiddler Ben Townsend.
Empty Bottle String Band [utoob] on stage.