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Genres make it easier to talk about music without actually hearing it. For instance: I am having a conversation with a Cellist. I tell him I like medieval music. He then says, 'Ok, that is not heavy metal, perhaps I might like this'.
Endless sub-genres can get annoying, but I think it's a means of separating musical ideas applied in music without in depth theory - 'It's punk rock' rather than 'An Am arpeggio over a 4/4 beat for the first four bars, followed by a bass playing the root while the guitar, a-melodically, follows the fifths from Am, while the singer opines on on the state of democracy, changing to a staccato chorus; the song lasts 64 bars'.
(Which is something like describing Pretty Vacant in musical terms).
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