| Gattung | Titel | Komponist | Komponiert |
|---|
| Oper | Abessalom da Eteri [აბესალომ და ეთერი] | Sacharij Paliaschwili | 1918-19 |
| Oper | Abessalom und Eteri | Sacharij Paliaschwili | 1918-19 |
| Oper | Absalom and Eteri | Sacharij Paliaschwili | 1918-19 |
| Singspiel | Abu Hassan | Carl Maria von Weber | 1811, rev. 1812 und 1823 |
| Oper | Acis and Galatea | Jean-Baptiste Lully | 1686 |
| Oper | Acis et Galatée | Jean-Baptiste Lully | 1686 |
| Oper | Acis und Galatea | Jean-Baptiste Lully | 1686 |
| Oper | Adelia, o La figlia dell'arciere | Gaetano Donizetti | 1840 |
| Oper | Adelia, or The Archer's Daughter | Gaetano Donizetti | 1840 |
| Oper | Adelia, ou La Fille de l'archer | Gaetano Donizetti | 1840 |
| Oper | Adelia oder Die Tochter des Bogenschützen | Gaetano Donizetti | 1840 |
| Oper | Adelson and Salvini | Vincenzo Bellini | ? |
| Oper | Adelson e Salvini | Vincenzo Bellini | ? |
| Oper | Adelson et Salvini | Vincenzo Bellini | ? |
| Oper | Adelson und Salvini | Vincenzo Bellini | ? |
| Oper | Adriana Lecouvreur | Francesco Cilea | 1899-1902 |
| Operette | Adrienne | Walter Wilhelm Goetze | 1926 |
| Oper | Agnese di Hohenstaufen | Gaspare Luigi Pacifico Spontini | 1829 |
| Oper | Agnes von Hohenstaufen | Gaspare Luigi Pacifico Spontini | 1829 |
| Oper | Ağrı Dağı Efsanesi | Çetin Işıközlü | 1972 |
| Oper | Aida | Giuseppe Verdi | 1869-70 |
| Oper | Ainadamar | Osvaldo Golijov | 2003, rev. 2005 |
| Oper | A Kékszakállú herceg vára | Béla Bartók | 1911 |
| Oper | Akhénaton | Philip Glass | 1983 |
| Oper | Akhnaten | Philip Glass | 1983 |
| Bühnenmusik | Aladdin | Carl Nielsen | 1918-19 |
| Oper | Alarich, König der Goten | Agostino Steffani | 1687 |
| Oper | Alarico, King of the Visigoths | Agostino Steffani | 1687 |
| Oper | Alarico il Baltha cioè L'audace re de' gothi | Agostino Steffani | 1687 |
| Oper | Albert Herring | Benjamin Britten | 1946, rev. 1947 |
| Oper | Alceste | Christoph Willibald Gluck | 1767 |
| Oper | Alcyone | Marin Marais | 1705/06 |
| Oper | Aleko [Алеко] | Sergei Wassiljewitsch Rachmaninow | 1892 |
| Oper | Alessandro nell'Indie | Giovanni Pacini | 1824 |
| Oper | Alexander in India | Giovanni Pacini | 1824 |
| Oper | Alexander in Indien | Giovanni Pacini | 1824 |
| Oper | Ali-Baba oder Die vierzig Räuber | Luigi Cherubini | 1833 |
| Oper | Ali-Baba or The Forty Thieves | Luigi Cherubini | 1833 |
| Oper | Ali-Baba ou Les Quarante voleurs | Luigi Cherubini | 1833 |
| Oper | Alimelek oder Wirt und Gast | Giacomo Meyerbeer | 1813, rev. 1814 |
| Oper | Alina, Königin von Golconda | Gaetano Donizetti | 1828, rev. 1829 |
| Oper | Alina, Queen of Golconda | Gaetano Donizetti | 1828, rev. 1829 |
| Oper | Alina, regina di Golconda | Gaetano Donizetti | 1828, rev. 1829 |
| Singspiel | Ali Pascha von Janina oder Die Franzosen in Albanien | Albert Lortzing | 1823-24 |
| Oper | Alkestis | Rutland Boughton | 1920-22 |
| Oper | Alkmene | Giselher Klebe | 1959-61, rev. 1962 |
| Oper | Alma de Dios | José Serrano | 1907 |
| Oper | Alzira | Giuseppe Verdi | ? |
| Oper | Amadis des Gaules | Johann Christian Bach | 1779 |
| Oper | Amahl and the Night Visitors | Gian Carlo Menotti | 1951 |
| Oper | Amahl et les visiteurs de la nuit | Gian Carlo Menotti | 1951 |
| Oper | Amahl und die nächtlichen Besucher | Gian Carlo Menotti | 1951 |
| Oper | A Masked Ball | Giuseppe Verdi | 1857-58 |
| Oper | Amaya | Jesús Guridi | 1910-20 |
| Oper | A Midsummer Night's Dream | Benjamin Britten | 1960 |
| Oper | Anacréon ou L'Amour fugitif | Luigi Cherubini | 1803 |
| Oper | Anakreon oder Die flüchtige Liebe | Luigi Cherubini | 1803 |
| Musical | Anatevka | Jerry Bock | 1964 |
| Oper | An der schönen blauen Donau | Franz Hummel | 1994 |
| Oper | Andronico | Giuseppe Saverio Mercadante | 1821 |
| Oper | Aniara | Karl-Birger Blomdahl | 1958 |
| Oper | An Istrian wedding | Antonio Smareglia | 1894 |
| Oper | Anne Pedersdotter | Edvard Fliflet Bræin | 1971 |
| Oper | Apollo et Hyacinthus seu Hyacinthi Metamorphosis | Wolfgang Amadeus Mozart | 1767 |
| Oper | Apollo und Hyazinth | Wolfgang Amadeus Mozart | 1767 |
| Oper | A Quiet Place | Leonard Bernstein | 1983 |
| Oper | Arald | Nicolae Bretan | 1939 |
| Oper | Argenore | Wilhelmine Markgräfin von Bayreuth | 1740 |
| Oper | Ärger in Tahiti | Leonard Bernstein | 1952 |
| Oper | Arlecchino | Ferruccio Busoni | 1914-16 |
| Oper | Arminio | Heinrich Ignaz Franz Biber von Bibern | 1690-92 |
| Oper | Arnljot | Wilhelm Peterson-Berger | 1907-09 |
| Oper | Aroldo | Giuseppe Verdi | 1857 |
| Oper | Artaxerxes | Thomas Augustine Arne | 1762 |
| Oper | Ascanio in Alba | Wolfgang Amadeus Mozart | 1771 |
| Oper | Aschenbrödel | Nicolò Isouard | 1810 |
| Oper | Aschenputtel | Gioacchino Rossini | 1816-17 |
| Oper | Askanius in Alba | Wolfgang Amadeus Mozart | 1771 |
| Oper | Aslak Hetta | Armas Launis | 1922 |
| Oper | Assassinio nella cattedrale | Ildebrando Pizzetti | 1955-57 |
| Oper | Attila | Giuseppe Verdi | ? |
| Oper | Auferstehung | Franco Alfano | 1904 |
| Oper | Aufstieg und Fall der Stadt Mahagonny | Kurt Weill | 1930 |
| Oper | Aunt Simona | Ernst von Dohnányi | 1911-12 |
| Oper | Aurelian in Palmyr | Gioacchino Rossini | 1813 |
| Oper | Aureliano in Palmira | Gioacchino Rossini | 1813 |
| Oper | Aurélien à Palmyre | Gioacchino Rossini | 1813 |
| Oper | Aurora | E. T. A. Hoffmann | 1811/12 |
| Oper | A View from the Bridge | Renzo Rossellini | 1961 |
| Oper | Az ajtón kívül | Sándor Balassa | 1978 |