I think all those artists are artists who are appreciated because you believe their words and you appreciate their honesty in their music. If you don't appreciate the honesty in the music, the beat can be fly as hell but you'll never give an emcee props.
The aim of every artist is to arrest motion, which is life, by artificial means and hold it fixed so that a hundred years later, when a stranger looks at it, it moves again since it is life.