From Zappa Wiki Jawaka
John Mayall (November 29, 1933) is a British blues singer.
After a spell in the army Mayall worked as a graphic designer while playing in local bands. In 1963 he moved to London and became a professional musician. He became a pivotal figure on the British Blues/Rock scene with the likes of Eric Clapton, Jack Bruce, Aynsley Dunbar, Larry Taylor and Harvey Mandel et. al. passing through his bands.
Link with Frank Zappa
In response to a question posted to his web site John Mayall said:
"I met Frank in New York in Jan 68 and he let me stay at his house for a few days in the summer of that year. (2401) We never played together but were very good friends throughout his life."