My life seems to be about music, so there are too many to mention, but two come to mind:

"Glow Worm" - don't know who performed it, but when I was a kid my grandfather liked that song and always requested it when I was playing the piano or my clarinet. I hardly ever hear it, but when I do, it sends chills up my spine.

And the other: Whenever "He'll Have to Go" came on the radio, my mother would stop what she was doing and sing harmony with Jim Reeves. I can still picture her, holding her dish towel, leaning against the big old white kitchen sink, head back and eyes closed, "and you can tell your friend there with you, he'll have to go...."

If I hear that song without advance warning (and sometimes with) I'll just start sobbing. It was so Mom.