Contents: I. Historical Perspectives: The Composition, Completion, and Early Reception of Mozart's Requiem. Fiction, Facts, and Open Questions. The Requiem Controversy (1825-39). The First Edition and Sussmayr's Testimony. The Original Requiem Score. Mozart's Composition. Sussmayr's Completion. Original and Imitation: Horn Rondo and Requiem. Epilogue -- II. Musical Aspects: The Concept, Structure, and Character of Mozart's Requiem. Background, Text, Formal Layout. The Musical Context. Individual Aspects -- III. Contemporary Documents: Genesis and Early Reception of Mozart's Requiem. Preliminaries. Chronology. Documents -- IV. Score of Mozart's Requiem Fragment. 1. Requiem. Kyrie. 2. Dies irae. Tuba mirum. Rex tremendae. Recordare. Confutatis. Lacrymosa (Beginning). (Continuation from Sussmayr's score). 3. Domine Jesu. Hostias. 4. Sanctus. Benedictus. 5. Agnus Dei -- Editions of Mozart's Requiem -- Writings on Mozart's Requiem -- Other Works Cited -- Index of Mozart's Works.