This Requiem Mass is in C minor. Introit "Requiem" and Kyrie through-composed, as well as Sanctus and Benedictus as well as Agnus Dei and Communio "Lux aeterna" Sequence "Dies irae" strophic with changing vocal line-up; two verses each musically identical (1. Dies irae and 5. Recordare, 2. Tuba mirum and 6. Ingemisco, 3. Liber scriptus and 7. Lacrimosa, 4. Quid sum miser and 8. Huic ergo)