Of all the songs I've ever listened to, by any artist, there's only one which makes me feel emotional for no apparent reason. By which I mean it's not attached to any life event, it doesn't stir a memory to cause the emotion, it's just the song itself that does it. That song is Heroes, so it has to be that one for me. As someone as said already, when you start trying to pick a song it hits home just how many fantastic songs he gave us.