I know of two recordings of Little Walter’s “You’re So Fine.” The more subdued version can be heard here: http://www.youtube.com/watch?v=lN6fgdVrpQY. There is a wilder version that can be heard here: http://www.youtube.com/watch?v=p7RBLLCqYi4. According to Wikipedia, one version was recorded between 1952-55 as a single, then released in 1958 on a compilation LP, The Best of Little Walter. Based on the Wiki article, I guess that the guitar part is played by Dave and/Louis Meyer of the Aces. Since the first version above is more smooth and quote/unquote professional sounding, I would guess that this is the one on the compilation LP, with the Meyers on guitar. The second version is much more interesting to me. It is quite wild and has an extended hot guitar solo from 1:12 to 2:22. I don’t believe I know the guitar player well, as a lot of what he plays sounds like it came from a blues-rock guitarist of the late 60s-early 70s. Little Walter died in 1968. Who do you think plays guitar on the “wild” version? It is very cool stuff.