Lonnie Johnson is one of my favourites too, I was recently listening again to the recordings he made in Toronto with Jim McHarg's band.
I saw The Blues Band at Camberley last night, great show but no 12-string played,just acoustic and electric 6-ers, dobros, dobro mandolin, lots of slide even washboard (but no kazoo!).
I forgave Dave Kelly his disparaging remarks about washboards as he played a Fred McDowell number.
BTW on a sleeve note to a Diz Disley re-issue there was a quote I may adopt as my motto: "his vocals add atmosphere rather than artistry"!
RtS (still stinkin' up the atmosphere!)