If you've ever heard Miles Davis playing over those dark, cloudy horn voicings on Sketches of Spain (1960) or Miles Ahead (1957), you've heard Gil Evans even if his name never came up. He was the arranger, which in most jazz contexts is a background job, but Evans turned it into something closer to composing a whole world for a soloist to live in. He didn't write flashy charts. He wrote charts that sounded like weather.

Evans came up through Claude Thornhill's dance band in the 1940s, where he got obsessed with unusual tone colors — French horns, tuba, clarinets doubling on other reeds — instruments you didn't normally hear in a jazz band. That interest in texture over flash is what he carried into his work with the Miles Davis Nonet on the sessions that became Birth of the Cool (1957). Already you can hear his fingerprints: everything moves slowly, nothing shouts, and the whole band seems to exhale together.

The records he made with Miles in the late 1950s are really the main event. Miles Ahead (1957) and Porgy and Bess (1958) aren't just backing tracks for a trumpet player — they're orchestral pieces where Miles is essentially a guest soloist inside Evans's own composition. The brass is thick and low, the reeds are voiced strangely, and there's a kind of Spanish, almost cinematic sadness running through a lot of it, which is why Sketches of Spain (1960) still gets played by people who don't even like jazz that much.

What people sometimes miss is that Evans kept working long after the Miles collaborations dried up, and he didn't coast on his old sound. By the 1970s he had an electric band, was covering Jimi Hendrix, and was leaning into jazz fusion with the same curiosity he'd once brought to Thornhill's reed section. He never had a signature hit as a leader, and he was never going to be a star — he was too interested in blending in with the music rather than standing in front of it. But put on any of his orchestral records and you'll hear a guy who understood, better than almost anyone, that arranging isn't decoration. It's the whole point.