Dick,

I find it quite funny that you discovered Sonny Boy Williamson through Mike Raven. Mike's programme was very good and required listening at that time but he was sometimes confused re the two Sonny Boys. Explaining the difference then playing an incorrect track.

Of course "Blues Singers" performed other types of material. Any musician/entertainer trying to scrape a living has to to give his audience or his A & R man what they they want to hear.