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? In search of some answers, we sought out the DIY concert producers of CapitalBop in Washington, D.C., as they presented artists from the Baltimore-Washington area. And we met with the musicians themselves — in one case, touring the place he calls home.