There's an emblematic photograph of Herbie Hancock on the back cover of his album Sunlight, which he began recording 40 years ago this month. He's depicted against a red backdrop with a Sennheiser vocoder headset on his cranium, which is bowed in deep focus.
Jazz has its capital cities: major hubs like New York, Chicago and New Orleans. But the music manages plenty well in many other places, too. What goes into those smaller ecosystems to enable jazz to thrive? How do talented musicians make it happen?