There was never a single song for me. It was more an evolution of genre...ish. I started as a kid listening to whatever was popular, then things such as Breaking Benjamin, Linkin Park, Evanescence, thinking they were hardcore. Then there was System of a Down and Rage Against the Machine. Then there was this brief obsession with the classic rock (AC/DC, Guns N Roses, so on so forth). And then an even briefer, and weird, scene of rap I listened to. And I still do listen to some. And I also do still listen some of previous mentioned bands. Then I heard of Killswitch Engage from a mate, got All THat Remains from Saw 3, The Duskfall from The Darkness, so on so forth. So now I listen to a mixture of rap, melodic death metal, heavy metal, classic metal, hard rock, classical (Well, a few songs here and there), evil disco (Static-X!) and others I can;t think of right now.
So like I said...never was one song. Although you could argue that Chers Believe made me hate everything with Auto-Tune in it, irrelevant of how funny people say it was in Rebecca Blacks video.