Joe on my knee

We play a lot of kids music in the car. Sometimes we'll just listen to a CD straight through and sometimes the kids take turns picking out songs. The other day Leo sprang a new one on me - he told me he wanted to listen to "Joe on my Knee". I was a little confused so I asked him what other words are in the song. He said "you know the Susanne song with Joe on my knee". It was then I realized he was talking about Oh Susanna!