Bassist Jason Roebke is a rock of the local jazz and improvised music scene, stealthily getting the job done in a slew of excellent bands—from Mike Reed’s People, Place and Things to James Falzone’s Klang to the Jeb Bishop Trio, among others. Tonight he plays at the Whistler as a member of cornetist Josh Berman’s new quartet. Since moving to Chicago back in 1999 he has only occasionally led his own groups. In fact, his current quartet, the Jason Roebke Combination, which plays on Wednesday night at the Hideout, has only performed a couple of times since debuting about a year ago. To a large degree the infrequency has something to do with the fact that alto saxophonist Greg Ward lives in New York these days, but I think local listeners would be smart to pay attention to this band—maybe it could result in more gigs.