Question: When was a ballet company founded who's most popular performance is a two-act ballet choreographed by Marius Petipa and Lev Ivanov?
Sentence (from "The Nutcracker"): The Nutcracker (Russian: Щелкунчик, Балет-феерия / "Shchelkunchik, Balet-feyeriya"    ; French: "Casse-Noisette, ballet-féerie" ) is a two-act ballet, originally choreographed by Marius Petipa and Lev Ivanov with a score by Pyotr Ilyich Tchaikovsky (op. 71).
Relevant evidence: Yes