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In his quartet, Miguel Zenon has one of the most sensitive and perceptive small jazz groups around. Those are important traits when working on a high-concept vision like the alto saxophonist’s: Zenon, a native of Puerto Rico, has an ongoing project that uses the jazz vocabulary to explore the music—folk, art, popular, et alia—of his homeland. With each new installment, the project gets more ambitious. He outdoes himself yet again on his 2014 recording Identities are Changeable, on which the quartet is joined by a 12-piece big band to portray the experiences of the New York Puerto Rican (“Nuyorican”) community. It’s music that was written for a large ensemble, an unusual turn for the saxophonist. Still, there are numerous passages for the quartet to play alone, and there’s much to be said for that more intimate, sympathetic context. Certainly Zenon himself must think so, since it’s the quartet (pianist Luis Perdomo, bassist Hans Glawischnig, drummer Eric Doob) that he’s got playing the music on his U.S. tour in the fall. Nov. 5 at Atlas Performing Arts Center. $20–$32.