Hi
If you can remember what type of guitars they were playing, this might be a big help, such as metal body "National's" or Wood body Reso type, electric, acoustic? Can you remember any of the songs? Check out Amazon.com, old blues recordings. Also there would be a good chance that who ever they were, they would have been playing festivals at that time in the U.S.
One other thing, did either play harp (harmonica)
All this would help narrow it down.
Please let me know if this helps
Rick
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