When Davis felt he could go no further with straight-ahead acoustic jazz, he embraced the electric age… by 1969, when he recorded the monumental double album Bitches Brew—the subject of a perceptive new monograph by George Grella Jr. in the 33 1/3 series—he had forged a bold new style, later dubbed the “electric Miles.” Today no period of Davis’s work exerts as much fascination for young jazz musicians.