Get some corresponding data with which you can correlate genre and year data? Other than that I don't see how you'll be able to easily correlate it. Genre can vary wildly by artist and song even if you did figure out a way to categorize them by relation or some such. Good luck though.
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Many have tried to destroy it... but... true evil never dies. It is only... REBORN
SUGGEST ME AN ALBUM - I'm probably not going to listen to it but I will if you bother me enough.
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