History musicians, the principal instruments, musical genres that compose this music. Erudite but easy to read, sensitive and relevant, THE essential bedside book as soon as is interested in blues: who composed this tune, what are the main discs recorded by more or less famous, what was life of Howling Wolf, Muddy Waters, Big Mamma Thornton or BB King, who influenced them ... All this and many other information and anecdotes that I have enjoyed reading and rereading this encyclopedia which deserves its name!