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In page Don Giovanni:

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The opera's final ensemble was generally omitted until the early 20th century, a tradition that apparently began very early on. According to the 19th-century Bohemian memoirist Wilhelm Kuhe, the final ensemble was only presented at the first performance in Prague, then never heard again during the original run.[1] It does not appear in the Viennese libretto of 1788; thus the ending of the first performance in Vienna without the ensemble as depicted in the film Amadeus may be an accurate portrayal. Nonetheless, the final ensemble is almost invariably performed in full today.[citation needed]