This is a tricky one. I was born in 1979 and it was hardly a good year for music. The song that was Number One when I was born was the YMCA!!
I have chosen a song which was featured in a film in 1979 but didn’t actually become a chart hit until 1991. It counts.
I love the message behind the song. I always do try to look on the bright side of life no matter how hard it is to do.