I was about to say that the wikipedia page for 'music' offers a good enough definition but the contents differ between the english and the french page... And there are like 200 hundred different version of this page.
From the english page is a quote I find interesting by musicologist Jean-Jacques Nattiez :
"The border between music and noise is always culturally defined—which implies that, even within a single society, this border does not always pass through the same place; in short, there is rarely a consensus ... By all accounts there is no single and intercultural universal concept defining what music might be."
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