In the 1960s, Miles Davis was probably the hippest cat on the planet. He personified cool elegance. Stylish in his Brooks Brothers suits, cruising Manhattan in his yellow Ferrari, one beautiful black woman or another on his arm. His theme song embodied a confident indifference to the straight world that so many jazz artists and fans admired and tried to emulate---So What! From Bebop to Hard Bop, to Cool, to Modal, from ages 19 to 40, he was instrumental in inventing all these new musical vocabularies.