There's a song I have which I have permanently tied to the memory of when my first girlfriend agreed to go out with me. A good day indeed. It was a hot summer day, I had it playing on my minidisc player on the bus ride home, the cool wind was blowing through the open bus window into my face, and right as the bus reached a certain intersection (Wharncliffe & Baseline), and the song reached a certain point, (around 2:53) I felt what can only be described as a perfect moment. Life was beautiful. 21 years; and I don't think any moment has topped it.
Anyway, it was a very good song... but from that moment on it's been a very great song.