Bugs Bunny's Overtures to Disaster was created in 1991.
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For the most part, it depends on the composer. Some composers
prefer to do things in order, but others will compose overtures as
they are inspired for them. This means that the overtures may not
necessarily be composed in order.
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Beethoven composed 10 overtures in total. Four of these are
written for his only opera, Fidelio. One of his popular overtures
is Egmont Overture (Opus 84).