Natal Eclipse is a relatively new ensemble from the fathomless imagination of alto saxophonist/composer Steve Coleman. The high-caliber group includes Matt Mitchell (piano), Greg Chudzik (bass), Maria Grand (tenor saxophone), Rane Moore (clarinet), Jonathan Finlayson (trumpet), and Jen Shyu (voice), but no drummer — reportedly to encourage the music’s fluidity. A hybrid chamber-jazz ensemble influenced by Charlie Parker, John Coltrane, and Béla Bartók, plus Middle Eastern and Chinese music, Natal Eclipse focuses on “spontaneous composition,” aka improvisation, at which Coleman excels. A tireless innovator, the Chicago native experimented early on with an ecumenical union of jazz and rhythmic elements drawn from funk and R&B, later immersing himself in studies of nature, ancient cultures, and global music, yielding complex, intellectual works pushing multiple boundaries. This new project should be no less fascinating.