Will all possible music ever be written? Melodies seem to be limited (though still vast). Timbre and harmonic complexity are the things that give us confidence that music is not limited.
Will we ever run out of poetry? Perhaps it’s a similar question (especially since music can have lyrics too).
Since poetry cannot always be translated perfectly, this does lead to an interesting idea.
… and similarly …
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Related: Music Ideas
Will we ever run out of unique music?