seeing as the US is the centre of the music industry, i'll use it as an example. rock music sales make up 24.8% of music sales, more than any other genre of music. pop sales are 11%, RnB 9.7%, rap 12.9%, country 10.7% and so on. thus rock is the most populatr genre of music. take that to a worldwide scale and its exactly the same overall.
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