You must run out and buy this disc. A guy at Tower Records once told me that this is the highest sellig jazz title of all time. There's no need to question why.
Every track is essential.
This is the start of modal jazz, just one of Miles' groundbreaking albums. Three of the five tracks are first takes. Miles sketched out the basic structure of each tune, then they recorded. The two other tracks are second takes. No real refining of these songs, but none was needed.