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- The Oath of the Dead (Zacharias Papantoniou)
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- 1938 music by Marios Varvoglis
- Oedipus at Colonus (Sophocles, c. 406 BC)
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- 1845 music by Felix Mendelssohn
- 1936 music by Ildebrando Pizzetti
- Oedipus, a Tragedy (John Dryden and Nathaniel Lee, 1679; based on Sophocles)
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- 1692 music by Henry Purcell, Z. 583, including Music for a while
- Oedipus the King (Oedipus Rex or Oedipus Tyrannus; Sophocles, 429 BC)
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- 1881 music by John Knowles Paine
- 1887 music by Charles Villiers Stanford, Op. 29
- music by Alexander Ilyinsky (died 1920)
- 1936 music by Leevi Madetoja
- 1941 music by Virgil Thomson
- Old Spain (Montagu Slater)
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- 1938 music by Benjamin Britten
- Ondine (Jean Giraudoux, 1939)
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- music by Henri Sauguet
- On ne badine pas avec l'amour (Alfred de Musset, 1834)
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- 1917 music by Camille Saint-Saëns
- On the Frontier (W. H. Auden and Christopher Isherwood, 1938)
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- music by Benjamin Britten
- Oresteia (Aeschylus, trilogy, 458 BC)
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- 1900 music by Max von Schillings, Op. 12
- Part I - Agamemnon
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- 1900 music by Sir Hubert Parry
- 1914 music by Darius Milhaud, Op. 14
- 1930 music by Ildebrando Pizzetti
- 1932 music by Marios Varvoglis
- Part II - The Libation Bearers
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- 1915 music by Darius Milhaud (Les choëphores, Op. 24)
- Part III - The Eumenides
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- 1885 music by Charles Villiers Stanford, Op. 23
- 1923 music by Darius Milhaud, Op. 41
- Othello (William Shakespeare, c. 1603)
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- music by Franz Salmhofer (died 1975)
- music by Clifton Parker (died 1989)
- L'ours et la lune (The Bear and the Moon; Paul Claudel)
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- 1918 music by Darius Milhaud
Read more about this topic: Plays With Incidental Music