Mr. Happy, you mentioned Blind Boy Fuller, but I don't see Sonny Terry on this list.

See this excerpt from an online biography:

"Sonny Terry, the best-known harmonica player from the Southeast, was born Saunders Terrell in 1911 in Greensboro, North Carolina. His father played jigs and reels on harmonica, and taught the instrument to Sonny, who had also been singing at church tent meetings. When two separate accidents blinded him in his youth, the harmonica was his only solace. "In them days I just as soon died-except for my harmonica. It was like a friend who didn't give a damn if I could see or not," he said.

He first heard the blues in Shelby, N.C., and after learning the style, began going to Raleigh and Durham to play for the hat on street corners. In 1934 he started playing with guitarist Blind Boy Fuller and also Gary Davis and moved to Durham soon thereafter."

-snip-

http://www.celticguitarmusic.com/harmsterry.htm

Btw, Mr. Ted, when someone at my former place of employment would ask the receptionist who is blind, whether a person was at work that day or not, invariably she would say "I don't know-I haven't seen her {or him}. One time I asked her about it and she said it was no big deal and that having people say to her "Have you seen [a co-worker]?" didn't bother her at all.

But, even though she said that I still tried to be very careful not to ask her "Have you seen {so and so}?

Best wishes,

Azizi