When a book, any sort of book, reaches a certain intensity of artistic performance, it becomes literature. That intensity may be a matter of style, situation, character, emotional tone, or idea, or half a dozen other things. It may also be a perfection of control over the movement of a story similar to the control a great pitcher has over the ball.
Raymond ChandlerAll art at some time and in some manner becomes mass entertainment, and if it does not it dies and is forgotten.
Raymond Chandler