Dan Levenson (Clawdan on the Banjo Hangout) plays and teaches Folding Down the Sheets. It is an old tune and one of his favorites. The written version is available in Dan's book: Old-Time Favorites for Clawhammer Banjo (MelBay 30224).
Dan plays the tune 3 times through - basic to advanced versions - up to speed, then slower. He then plays the basic and advanced versions slower yet and breaks them down into small phrases so you can learn it too!