Look at that line-up! :)
No need to mention this is a great performance..

Helen Humes : vocal
Sonny Terry : harmonica
Brownie 'Kazoo' McGhee : vocal, guitar
Willie Dixon :vocal, bass
T-Bone Walker : vocal, guitar
Memphis Slim : vocal, piano
Jump Jackson : drums

The American Folk Blues Festival (also American Folk-Blues Festival, and AFBF) was a music festival that toured Europe beginning in 1962.
German jazz publicist Joachim-Ernst Berendt first had the idea of bringing original African-American blues performers to Europe. Jazz had become very popular, and rock and roll was just gaining a foothold, and both genres drew influences directly back to the blues. Berendt thought that European audiences would flock to concert halls to see them in person.
Promoters Horst Lippmann and Fritz Rau brought this idea to reality. By contacting Willie Dixon, an influential blues composer and bassist from Chicago, they were given access to the blues culture of the southern United States. The first festival was held in 1962, and they continued almost annually until 1972, after an eight year hiatus reviving the festival in 1980 until its final performance in 1985.