Strauss by Levi

I read "Richard Strauss" written by Levi many years ago
A brief description of his musical production, with a particular accent to poems and opera, analysed in three steps: orgiastic operas (Salome and Elektra), the mid age period (Rosenkavalier and Die Frau ohne Shatten) and the final era (Intermezzo and Capriccio)