, Million Songs Dataset, , , , . , , .
If you're looking for a raw sound ... that's another matter. I do not know if you want to publish, in which case the law on intellectual property may be a more important factor. But for private testing, I suspect that you can simply use files from your own music library (for example, iTunes downloads already have a genre tag to test your algorithm).
Disclaimer: I am not a lawyer. Take my legal advice at your own risk.
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