That one song

Can you think of a song that hits your nostalgic feels in an unfathomable amount of happiness?

Mine would be Seasons in the Sun by Terry Jacks.
I first heard that song on my moms cassete tape back when I was little kid. It was terrible quality but I still loved it. I asked my mom years later, what song is that? In which I hummed to her, but she said she didn't knew.
Later on I found the song this Christmas. I just didn't knew what to react. Such warm feelings I felt that day.