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See? That's your recent Thread and precisely what I was talking about:

Yeah that is based upon the country.

But then it doesnt happen in 95% of the instances. And if someone picks a song from their country, it goes through.

And that would be a huge copyright issue with most of music :)

And who are they going to send notice to?

I guess the copyright owners would approach it the same way as torrents - they'd fight people uploading the content and try to get money from or rid of the access points. In this case, the websites used to play the music. I am no legal expert though, and it would certainly depend on various jurisdictions worldwide.