"Agnus Dei", in many settings of Mass and Requiem set with dark expression, begins in F major with a fluent expansive melody in the orchestra. After six measures, the tenors sing a melody to it that gently rises and falls, and repeats it almost the same way. Then, while the motion in the orchestra stays the same, the key changes to the minor mode, and the Lamb of God is asked for rest in chords of daring harmonic progression. Then the tenors, without instrumental introduction, repeat the first line, leading to a peaceful "".