The recording, as I recall, is from the Kenny Neal album Double Take, which is on Rhapsody and also can be downloaded in MP3 from Amazon.com. And there’s this YouTube link, which I think has a different cut, but one that illustrates Lowboy’s point.
When I listen to this clip I can’t help but thinking “Wow! Can somebody do that with a melodica?” The melodica has its own unique set of expressive possibilities, I’m thinking, but trying to get a blues harmonica sound is one way of exploring those possibilities. Toots Thielemans next, somebody?