Brainteaser

A man is sitting in a cafe feeling rather poor. He sees the man next to him pull a bunch of $50 notes out of his wallet. He turns to the rich man and says to him, "I have an amazing talent: I know almost every song that has ever existed." The rich man laughs.The poor man says, "I am willing to bet you all the money you have in your wallet that I can sing a genuine song with a lady's name of your choice in it." The rich man laughs again and says, "OK, how about my daughter's name, Joanna Armstrong-Miller?"The rich man goes home poor. The poor man goes home rich. What song did he sing?