Phantom Of The Opera. I got to meet Sierra Boggess (Christine) and Norm Lewis (Erik/The Phantom Of The Opera) and Jeremy Hayes (Raoul de Chagny) and Ellen Harvey (Madame Giry)
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It's a bit stereotypical but I do always fall back to Hamilton just because it was one of my first exposures that got me hooked.
More recently, I would say my favorite musical is Hadestown.
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