The Wells Cathedral Choir extended its 10-year relationship with the American composer Gary Davison with the moving world premiere of his Requiem on Remembrance Sunday afternoon. The Dallas-born church musician has found a champion in Wells’ choirmaster, Matthew Owens, who has maintained a commitment to new music throughout his career. Settings of morning and evening canticles by Davison have paved the way for the 45-minute Requiem for choir, organ, mezzo-soprano and viola. If the use of viola references the Fauré Requiem, in which it forms the top line, so does the opening of Davison’s work, which begins on a plangent, pulsing unison with modal inflections. We are in the world of updated plainsong with clean melodic lines and spare, expressive harmonies.Davison sets 11