Music director Earl Lee conducts the A2SO and music director Scott Hanoian the UMS Choral Union in a performance of Mozart’s sublime final masterpiece, unfinished when he died in 1791. Mozart’s widow Constanze told the story that Mozart came to believe he was writing the Requiem for his own funeral. Guest soloists are soprano Hera Hyesang Park, mezzo-soprano Avery Amereau, tenor Nicholas Phan, and bass Stephano Park. Performed in German with surtitles. The program opens with Brahms’ rarely performed Alto Rhapsody. 7:30 p.m., Hill Auditorium. Tickets $23–$108 (students, $15–$20) in advance at ums.org/season & (if available) at the door. (734) 994–4801.