The Individualism of Gil Evans: terrible artwork, incredible album. I struggled for a long time to get into this kind of orchestrated jazz; then the light went on one day listening to one of the Gil Evans arranged Miles Davis albums. This one’s got it all (except Miles): tunes, tone, moods, the funk, and some incredibly intense drumming.
It’s an ideal candidate for a nice vinyl re-issue, though; this c.1974 copy misses some of the best tracks. So here it is in full on Spotify: