George Harrison - Give Me Love (Peace on Earth)
This song has been playing in my head over and over for several days. I don't know if it popped into my head due to the social unrest (and all of the other stuff going on in the US in the past few days), but this song just keeps playing. Even hearing it as background music when I'm sleeping.
Listening to it while looking it up to post for this thread and it's bringing a tear to my eye.