Although it's another one of those "two of three I can't dig up on youtube", I'll put in a near miss, a vague explanation, and an actual performance. 

Bob Brozman is known as an ethnomusicologist.  Simply stated, not only does he study the cultural aspects of music, he's a fantastic musician who brings the music to life and can explain in great detail depths and facets of the music you've never considered - almost without care or consideration of how much you previously knew.  He plays a wide range of styles, I'm particularly taken with his slide guitar and his Hawaiian guitar work myself. 

The actual song was "New Vine Street Blues", but instead I'll give you Highway 49 Blues. 

The second song is one of the albums I consider absolutely essential for Canadian fans of the Arts.  The Rheostatics were commissioned by the National Gallery of Canada to write an album inspired by the works of the Group of Seven.  It was released to much acclaim, both as a tribute to the Group of Seven and as a solid and separate work unto itself.  The tracks did not have official names, so the actual track was numbered "One", although the unofficial title of the song is "Kevin's Waltz."  Go watch Laurie Brown's story on it from the CBC.  You'll get a great feel for it from her story. 

Last was Robert Plant and Allison Kraus playing Townes Van Zandt's song Nothin'.