Don Juan was an opera composed by Wolfgang Amadeus Mozart in the 18th century. Its subject was the Spanish nobleman Don Juan.

In 2376, The Doctor, in his first appearance on the Qomar homeworld, performed selections from this opera and two other operas for the Qomarians. (VOY: "Virtuoso")

According to the Star Trek Encyclopedia (4th ed., vol. 1, p. 215), this opera was co-written with Lorenzo Da Ponte and first performed in 1787.
The opera is better known by another name, Don Giovanni.

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