So Mozart didn’t write his Requiem Mass in D Minor all by himself. Its completion by others is a story of intrigue and deception. You can hear the magnificent result on Music Sunday at the First Unitarian Society in Newton, 1326 Washington Street, this Sunday, March 22 at 10:15AM. It will be performed by a combination of the choirs from three UU congregations (Dedham, Needham, and Newton) with orchestra and professional soloists. The same event was presented last Sunday in Dedham, with this review: “A really amazing and moving performance.” Admission is free, with donations accepted.