Sure does, a musical is anything that advances the narrative or deepens the understanding of a character.
a musical is not... a story and then 1 character or a bunch sing 1 song for no reason whatso ever or even if it does help progress the storyline or an understanding of the characters, a musical by nature primarrily advances the narrative, these are the few main examples of musicals most people are familiar with...
Opera: Singing all the way through, no direct (normal speach of any kind)
Rock Opera: this would be same as above only with a rock style to it, examples would be the queen musical and Jesus christ super star.
Booker musical: This is the sort that disney loves, the plot is advanced by singing and dancing, as well as the character development, e.g. the lion king, the songs in that help develop the characters however the dialogue makes the story progress. From what I remember a nightmare before christmas is a booker musical but the oposite, the songs are the main driving force behind the narrative progression. e.g. when Jack arrives in Xmas land, his song "whats this" helps to advance the plot because he's starting to see theres a world outside his own full of new possabilaties.
And then theres the other lesser known ones.
e.g. variety musical/compilations: these are things like the musical "Fossy" there is no plot, no main role, no characters (as such) just songs and dance numbers from numerous musicals.
Music hall: Almost never heard anymore, this is all the cole porter and pub songs from the early 20th century.
e.g. you wont find this on broadway or the top 10...
"With my little stick of blackpool rock, Along the promanarde I strol, It maybe sticky but I never complain, its nice to have a lick at it now and again."
lol I hope that helps clear up some what is a musical and what isnt. but pretty much 95% of disney animation in fact of most annimation (western) is musical.
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