Start with the basics: Henry Threadgill plays alto sax and flute, but the instrument he's really mastered is the ensemble itself. He came up through Chicago's AACM in the late 1960s, that collective of musicians who decided jazz didn't have to sound like jazz to be jazz, and he never let go of that permission. His trio Air, with Fred Hopkins on bass and Steve McCall on drums, made records in the 1970s that could swing hard and then dissolve into open space without warning. Their Air Lore (1979) record, reworking Scott Joplin and Jelly Roll Morton tunes through a free-jazz lens, tells you a lot about how Threadgill thinks: tradition isn't something you preserve behind glass, it's raw material.

What makes him worth seeking out isn't just the improvising, though he's a distinctive player, all vocal cries and sudden turns on alto. It's the writing. Threadgill has spent his career avoiding the standard jazz combo shape. Very Very Circus, the band he ran in the late '80s and '90s, had two tubas and two electric guitars instead of a bass and a rhythm section, which meant the low end moved in ways nobody expected. Zooid, his group from the 2000s onward, works off a system he calls intervallic composition, where the harmony grows out of specific interval relationships rather than chords. It sounds technical because it is, but you don't need the theory to hear that something structurally different is happening under the surface.

His music can be a tough entry point if you're used to horns and rhythm sections doing what horns and rhythm sections usually do. There's a density to it, a refusal to resolve the way you expect. But it's not cold or academic — there's humor in it, and a real physicality, especially live. Too Much Sugar for a Dime (1993) is a good place to hear that mix of complexity and swagger. Up Popped the Two Lips (2001) shows the early version of the Zooid sound taking shape.

In 2016 Threadgill won the Pulitzer Prize for Music for In for a Penny, In for a Pound (2015), which made him one of the only jazz composers to get that recognition. It didn't change what he does — he'd been building this particular architecture for forty years by then — but it forced a wider audience to catch up to something the AACM crowd and serious listeners had known for a long time. He's still working, still recomposing his own rulebook record to record, which is rare for anyone this deep into a career.

If you want the short version: Threadgill is a composer who happens to also play saxophone, and he's spent his life proving that a band doesn't need a bass player to have a bottom, or a piano to have harmony. He built his own toolkit instead of borrowing everyone else's, and forty-plus years later that toolkit still sounds like nobody but him.