Aria of Sextus from the opera seria "La Clemenza di Tito" ("The Clemency of Titus") K. 621 Aria of Sextus from the opera seria "La Clemenza di Tito" ("The Clemency of Titus") K. 621 Main opus "La Clemenza di Tito" ("The Clemency of Titus"), Opera seria in two acts KV 621