Shhh. The command to be quiet is not just part of the title of one of the two sprawling compositions on this pioneering album. It’s also an apt metaphor for the relaxed hypnotism and spaced-out atmosphere that define In a Silent Way, a record that pushes the boundaries of studio possibilities, artist-producer relationships, and rock-jazz chasms. Recognized as Miles Davis’ first full-on fusion effort and part of his “electric” era, the 1969 landmark claims a Who’s Who lineup that sends the music into an ethereal stratosphere.