On this EP of six tracks, brothers and pianists Lucas and Arthur Jussen explore repertoire that was originally based on a sacred aria or chorale melody. CANTUS includes Anderson and Roe’s two-piano arrangement of “Aus Liebe will mein Heiland sterben” from Bach’s St. Matthew Passion, and Reinhard Febel’s four-hand arrangement of Bach’s setting of the chorale “Erbarm dich mein, o …