It’s no secret that bass players don’t get enough respect. Most jazz groups depend on the bassist as the structural anchor, tracing out the chord changes and keeping time. Jason Roebke does this about as well as anyone in the Chicago jazz scene, and he fulfills this role in countless ensembles. He even leads and writes the tunes for his own terrific +Octet—named thusly because it always contains more than eight members—yet even there he rarely steps out to grab the spotlight. He serves the ensemble, the selfless role traditionally required of the jazz bassist. But he’s a terrific improviser, and he rarely squanders the space he gets in the various combos he’s a member of. Roebke recently released Panoramic (Not Two), a sublime duo recording with Berlin-based reedist Tobias Delius (known best in these parts as a member of Amsterdam’s ICP Orchestra), where his entire performance is improvised.