That's a very hard question for me to answer, my soul is many colours.
Although mostly I think "All The Way Down" by Biffy Clyro.
Here's a live version on Youtube:
http://www.youtube.com/watch?v=Yj63IvFVsg4
I feel a connection to the lyrics, they're very emotional, but still ambiguous enough for me to apply it in my own way to my own life. The music itself is amazing- the dynamics and build just blow me away every time I hear it.
But also I have an emotional connection to the song. This band, Biffy Clyro, have only just really hit fame in the UK this year, but they've been one of my favourite bands for years.
Anyway, a couple of years ago, they played Preston, my home town, and my best friends band played their support act. I was so proud of them, I got a bit tearful at the end of their set.
Then when Biffy got on stage and unexpectedly played this song (it's my favourite, but definately one of their lesser-known tracks), I just cried like a girl!
The band are really nice guys, too- I found them really easy to talk to, which is definately something you want in a band.
(Phew! That was a long, rambling post! But that song really does touch my soul!)