Anything you love about music, no matter the genre, can usually be traced back to one seminal recording that introduced a trend or technique that forever changed the way people make music. On the flip side of that, of course, is the fact that you can also pinpoint those moments in music history where, even if no one realized it at the time, things took a turn for the worse.

CLICK: 4 Classic Rap Albums That Ruined Rap Music, via Cracked: