> concert hall full of rich, fancy people

Not to harsh your schadenfreude buzz, but this is not the right image. Classical music was mass culture at the time.

Opera, in particular, was popular with all classes. (There's a delightful sequence in, I think?, "The Leopard" of brick-layers coming to blows over the merits of one singer versus another.) Recordings of famous singers were the first "hit" gramaphone records. Enrico Caruso sold out concerts all over the world - and (in legend, at least) sometimes gave impromptu balcony concerts to disappointed punters gathered in the street below.