Starting from an unused funeral march he’d written years before, Brahms began his requiem after the death of his mother in 1865, an event that added timely weight to his longstanding desire to memorialize his friend and mentor Robert Schumann. It all tied together, at least for writers, when Brahms bumped into Clara Schumann (widow to Robert and friend to Brahms’s mother — and around when Brahms had thought up the funeral march while trying to write piano music) outside the Bremen cathedral on the way into that first performance.

Written on a personal impetus during the romantic period (virtually defined by the concept of personal narrative), the Requiem is not liturgical. Its full title translates as “A German Requiem, after words of the Holy Scriptures.” There are only two soloists: a soprano singing of consolation on behalf of Brahms’s mother, and a baritone whose “Behold, I tell you a mystery” solo anchors a movement so searching, emotional and yet historically learned that it simply must be a musical conversation with Schumann.