Thats because the original napster and kazaa made file sharing so easy everyone and their grandma are on it. That resulted in the riaa and music publishers planting corrupted mp3s all over the place on kazaa hoping to make people get frustrated with downloading junk. Then you have those idiots who downloaded a song full of static and not deleting it and sharing it all over the network too. If you are going to download a mp3 or album, you'd have better luck getting a good version by going on irc or using bittorrent.

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-Kalvin