Little Walter’s Jump, 1967. From here: “Little Walter‘s harp is accompanied by Hound Dog Taylor (guitar), Dillard Crume (bass), and Odie Payne (drums), at the 1967 “American Folk Blues Festival” in Germany just months before his death.”
There are a lot of Utoobage entries for Elmore James, but I couldn’t find any live video performances, so let’s go with some covers, with links to the original recordings.