The Living years by Mike and the Mechanics is a song that always wells me up.
About 20 years ago I went to work in Sri Lanka and during an off day on the beach someone was playing this on his portable. The lyrics moved me to the point of phoning home to speak to my dad (no reason why I hadn't before) because every time he ever answered the phone he always handed it to my mother to speak. On this day in particular he was out (typical) so I told my mother I'd call back the next day. The next day came and as I spent ten minutes chatting to my dad about mundane things I eventually told him I loved him. The phone went dead for a moment before my mother came on the line and told me off for making the old man cry and even though I had him for another 20 years or so I'm grateful for that song in helping me to tell him how I felt when it mattered. I'll always think of him when I hear that song.