Raw and Brilliant Duo
In the early 1970's, the great Big Walter recorded with guitar player Jimmy DeBerry. The sound here isn't so perfect. And that's a compliment. The guitar sounds can be rough and simple. The harp sounds are, well, the best thing in this world.
If you're going to label these recordings 'the best thing in this world,' it would help to provide a purchase link. Sorry. I don't think these are that easy to track down. But do keep an eye out for these albums. You are looking for the Crosscut label, with albums titled EASY VOL. 1 and BACK VOL. 2.