Gerard is Herzhaft blues specialist in France but it is also recognized worldwide as this encyclopedia has lasted for 30 years and has been translated in all languages. The more herzhaft is its historical approach and close bluesmen he touched. And this is what happens in all these books. Mine of information where the point of view of discrete author fly where others are kind of books directory automatically. It is not for nothing that the us to Universalis, Scorcese or Universal it appealed to him. A must-have