More than anything, I think what best separates an opera from a musical is the era in which it premiered, the language in which it was written, and the place it debuted.
Turandot premiered at La Scala in 1926, and was sung in Italian. It was one of the last entries in the canonical repertoire of most opera houses.
Show Boat premiered on Broadway in 1927, and was in English. It was one of the first great musicals.
Of course, there have been many great operas written since 1926 and there were musical comedies and revues that debuted long before 1927. But I don't recall many operas that were written in English and debuted in a Broadway house. And I don't know of many musicals that weren't in English and didn't debut in either New York or London.
So to tweak Sondheim's definition, I think if it's new, it's in English, and it's on Broadway or in the West End, it's probably a musical. If it's a century old, is in another language, and is from Milan, Paris, Vienna, etc., it's probably an opera.
Operas have been adapted to Broadway (i.e. Aida, or Porgy and Bess) and opera houses have performed musicals (i.e. Sweeney Todd, or The Most Happy Fella). But they're the exceptions to the rule.
Updated On: 7/16/15 at 01:38 AM