This unnamed Opera House (possibly the Paris Opera House) acts as the site of the final battle in Mickey, Donald and Goofy: The Three Musketeers. During an unnamed opera which Minnie was planning to attend, Pete kidnapped her put her in a chest and dressed one of the Beagle Boys (Shorty) as her. Then the opera began. Then Mickey Donald and Goofy arrived just in time to rescue Minnie.
Then the Major General sang his song (the opera featured events from Gilbert and Sullivan's Pirates of Penzance) but the battle interrupted some of his lines then Mickey fought Pete but was almost wounded then he used his friends to make himself taller and get Pete. As Pete was beaten he said "I hate happy endings" then he fell. After that the characters celebrated except Pete who might have survived.