Peter T, I know that Guy Van Duser did an awe-inspiring version of Sousa's "Stars and Stripes Forever" a number of years ago, on nylon-string guitar. Very discouraging for the rest of us guitar players who thought we were pretty damn good until then.

I think the point of this thread was to look for the "barn burners" that impress with speed and flash, not depth. Orange Blossom Special for fiddle, Dueling Banjos for any combination of instruments (Martin Mull did a version years ago called "Dueling Tubas"), "Crossroads" for electric power trio (which ultimately led Clapton to question whether he wanted to continue playing with Cream), etc. Whether that "wow!" factor is desirable or not is a matter of personal taste.

I used to do Beaumont Rag with another guitar player, and it invariably got the desired "yee hah!" from the audience. I felt like a whore.