What would you like it to be?
My thought was something romantic when I went searching, but it turns out that (a) my patience isn't exhaustive and (b) most of the scores I found were too perfect -- I wanted something that didn't look computer-generated and looks as though it's been played a time or two. Preferably on an old piano. What I found was Sheet Music of Mohave Song
), which is, if I understand correctly, a transcription of music performed by native peoples and recorded by Alfred Louis Kroeber in 1910.