Pianist Pandelis Karayorgis has spent nearly 40 years here in the U.S. developing a distinctive voice that extends from the foundations built by such heroes as Thelonious Monk and Paul Bley. While much of his work has emerged from the creative scene centered in greater Boston, he also has long-standing connections in Chicago—which include noted instigator Dave Rempis who has assisted here in assembling a brand new group of bold improvisors.