Endlessness, Nala Sinephro’s second record, centers on an arpeggio. Endlessness dissolves the binaries that define ambient jazz and imagines a third sort of music that thrives at their midpoint. Its seamlessness distinguishes Sinephro’s second album from its still excellent predecessor, which was alternately atmospheric and bluesy. It both proves ambient jazz’s endurance and renders the two terms mutually redundant. Sinephro plays harp, piano, and synths both modular and otherwise alongside a who’s who of friends from South London’s jazz scene.