Berlin Gemany 1987 Coco Montoya and Walter Trout On Guitars.
I found this gem in The JazzGeek News in which yours truly just happened to be the No 1 top story!
I happened upon John Mayall in 1968. When everyone was playing pop, here was this amazing guy John Mayall playing. Where John Mayall led, Jimi Hendrix, Eric Clapton, Led Zeppelin followed.