Miles Davis - The Complete Birth of the Cool 2LP

So dubbed because these three sessions - from 1949-50 - are
where the sound known as cool jazz essentially formed. Birth
of the Cool remains one of the defining, pivotal moments in jazz.
This is where the elasticity of bop was married with skillful, big-
band arrangements and a relaxed, subdued mood that made it
all seem easy, even at its most intricate.

Deluxe expanded 2LP set with live tracks