There's a tv commercial on rotation at the moment with this great duo doing I think this song 'Hootin' the Blues'...watch the clip and see if you recognise it. Sonny Terry's style is quite individual and very easy on the ear and seems quite a different animal than a lot of harp players in the r'n'b idiom. They were quite an influence on the skiffle scene in this country. Watch him play it with Pete Seeger here