In order to avoid ambiguity, the word opera is added to the title in parentheses, so for example Macbeth (opera) refers to the work by Verdi to distinguish it from Macbeth which is the play by Shakespeare.
If there are two (or more) operas with the same title, the second (and subsequent) works take the name(s) of the composer(s) in parentheses, so for example Otello (Rossini) is differentiated from the more famous opera of Verdi which is simply Otello.
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