As jazz albums go, Miles Davis’s Kind of Blue represents a high-water mark. The record came at a time of profound musical innovation: bebop had given way to hard bop, a more soulful version of jazz, but Davis wanted to simplify the music and send it in a new direction. The triumvirate of Miles, John Coltrane, and Bill Evans pushed the boundary of what musicians could do, creating a work of hushed magnificence, said James Kaplan ’73. Kaplan is the author of 3 Shades of Blue: Miles Davis, John Coltrane, Bill Evans, and the Lost Empire of Cool, a book…