| 11. | Neither the music nor the libretto of this work has survived.
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| 12. | The work is a setting of a libretto by Maurice Maeterlinck.
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| 13. | In 2001, Toshiba released the L series range of Librettos.
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| 14. | Stephenson wrote new lyrics and a libretto to fit the music.
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| 15. | Starytsky wrote librettos, songs, stories, dramas and poems.
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| 16. | No printed libretto or vocal score is found in British Library.
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| 17. | Otto-Peters even wrote a libretto for such an opera.
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| 18. | Libretto by Marius Petipa, based on an ancient Greek myth.
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| 19. | Rinuccini's libretto is available in a number of editions.
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| 20. | The Libretto was written in English and then translated into Japanese.
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