Sonny Boy Williamson (John Lee Curtis Williamson, March 30, 1914 — June 1, 1948) was an American blues harmonica player, and the first to use the name Sonny Boy Williamson.

Details: http://en.wikipedia.org/wiki/Sonny_Boy_Williamson_I

Sonny Boy - Harps of Angels, Pt 1. A documentary on the almost forgotten but seminal John Lee "Sonny Boy" Williamson, also known as Sonny Boy Williamson 1st.