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A song I would hum to my baby boy to comfort him and help him get back to sleep, though I didn't know what song it was.
Years later I hummed it to my mom, asking if she knew it.
She looked at me in surprise and said it was the song she would sing to me when I was a baby.
Probably not the most appropriate song to hum to your newborn child, but I guess it was popular a few years before I was born.
So here's Jim Reeves with "He'll Have to Go"