No intents on spamming Off-Topic, but having read the "Music or Lyrics?" thread, it kind of popped an interesting question.
Everyone has at least one song that they cannot live without. And to get to the question fairly quickly, but what song had the greatest impact in your life? Like one that you can relate with in one way or another. Saying why is optional but not necessary.
For me, its Angel's Son by Sevendust. The lyrics to the song explains the reason well enough lol.