I first bought this record over 40 years ago when I was 17. I remember being slightly disappointed on first hearing, it had none of the heavy riffs I was into at the time. I came back to it from time to time and as I developed as a listener (and a person) I began to appreciate the great music that it is. You can read about the argument the band had with Miles before the session, this was a charity concert and they weren't being paid, but listening to the interplay between the musicians perhaps some points were being made. There is a depth here that possibly exceeds most, if not all, other Miles small group recordings. The more I listened the greater my love of this record grew, if I had to choose one Miles record this would be it. I found out many years later reading Miles autobiography that this is his favourite record, I was very happy to be in agreement with him. I will not describe the music as the simple thing to do is to listen and hear it, again and again and again. Each time you play it try focusing on a different member of the group, for example Tony Williams, 18 years old at the time, is doing astounding things on the drums much of which can pass you by on first hearing. Overall, like all great jazz, it is the interplay between the performers that provides the art and this is great art.