At the following location, you will find links to "Standard Midi files on the net - Bluegrass":

http://www.aitech.ac.jp/~ckelly/midi/search/Bluegrass.html

Hope the tune is in there. Don't know where you would find the sheet music. If you have Noteworthy Composer, I could type it in for you and send you a sheet music file or a midi file. But check out this link first. - RIta Ferrara