Twenty five years ago, Steve Coleman hit town talking Bunky Green, Bunky Green, Bunky Green. The 70-something Chicago educator is an idiosyncratic alto man who bends the norm to suit his needs and comes away with solos that burst with singularity. Ten years ago, Rudresh Mahanthappa, himself an idiosyncratic alto player, also stressed BG’s skills in conversation. Now they’re a wily intergenerational front line, putting a few gigs under their belt as they prep for a studio session. Expect slippery lines and piercing attacks, and bet dollars to donuts that pianist Jason Moran feeds the fire.

Tue., April 20, 7:30 & 9:30 p.m.; Wed., April 21, 7:30 & 9:30 p.m., 2010