Their music wasn't even that good or "revolutionary". Songs like Gangnam Style is what this music industry desperately needs. It is better than any of the Beatles songs, and has the views to back it up.
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You do not appreciate the classics. If it wasn't for any of the innovative artists before Gangnam Style, it probably wouldn't be here. Appreciate The Beatles, Pink Floyd, Led Zeppelin, so on and so forth. And not I'm not comparing them to hip-hop, just saying.