Conversation so far:
What was in Blind Lemon Jefferson's biography?
Blind Lemon Jefferson was born blind, near Coutchman, Texas.
When was Blind Lemon Jefferson born?
Jefferson's birth date was recorded as September 1893.
When did Blind Lemon Jefferson start performing?
Blind Lemon Jefferson began playing the guitar in his early teens and soon after he began performing at picnics and parties.

Question: What instrument did he play?
Self-contained rewrite: What instrument did Blind Lemon Jefferson play?