Opera about a morally conflicted crime boss who's seen a therapist.
The Mezzo Soprano Opera is a social event that Milo and co. attend for extra credit for Miss White's class in the episode, "Smooth Opera-tor". As stated by Amanda Lopez; "it's about a morally conflicted crime boss who's seen a therapist." It conventionally lasts for two hours and eleven minutes.
The image gallery for Mezzo Soprano Opera may be viewed here.
The Opera, about a Mobster who goes to a Psychiatrist due to feel emotionally conflicted, is a reference to the TV show "The Sopranos". The main character of the Opera is even named "Mr. Mezzo Soprano".