When each of my kids was very young, I chose, for one reason or another, a song that makes me think of that child. If I'm missing them, or during times where we're fighting, or if they're going through hell and I would do anything to help, but can't - these three songs are emotional dam-busters.
Yesterday, Keith and I were out somewhere, and there was faint music playing in the background. He cocked his head to the side and said, "Is that our song?"
It was. We smiled at each other, our little secret connection right there, in front of everyone, and no one knew but us.