I looked for a clip of him playing his Guild X-700, but, aside from The Blues Brothers clip, couldn’t find one.
Here’s his signature blues, in memorium.
Google > Memphis Slim & Matt Murphy - Matt's Guitar Blues
You'll then get treated to a wonderful YouTube video. Got hooked on Memphis Slim's piano around 1971, and Matt "Guitar" Murphy was Slim's guitar player for many years. Still love this stuff!