How many overtures did Beethoven compose for Fidelio?

Beethoven's opera, Fidelio was originally titled Leonore. He wrote three overtures, each time deciding the overture was too strong to serve as a prelude to the opera. After he revised the opera and changed the title he wrote a fourth overture, this one bearing the new title, Overture to Fidelio.

All four share melodic features and a similar structure. Some conductors have inserted the 3rd (and most famous) of the Leonore overtures as an intermezzo between the last scenes of the opera.

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