"Fifty Million Years Ago" by Jones and Schmidt from Celebration, 1969
Nota bene: this has quite a driving tempo, faster than most people can sight read. Take your own accompanist.
Nobody sings this song any more. They didn't sing it "then" either.
Then start listing to old cast recordings. Or just recordings of standards from what is now called The Great American Songbook. Get a song library into your head.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher