The evolution of the record producer from organizer to auteur, from Phil Spector and George Martin to the rise of hip-hop and remixing. In the 1960s, rock and pop music recording questioned the convention that recordings should recreate the illusion of a concert hall setting. The Wall of Sound that Phil Spector built behind various artists and the intricate eclecticism of George Martin's recordings of the Beatles did not resemble live performances--in...