Mine would have to be "This Will Make You Love Again" by either IAMX or Blue Stahli.
It's one of those you seem to love the more you hear it. I feel very... peaceful just watching the world go by listening to this.
So what's yours? I'm curious and I want to know!
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My girlfriend and I choose this to be 'our song'. I love it due to the memories and feelings it brings up.