I thought this would be appropriate for today. Please share results below. I did very well, but I have the advantage of having recently taught my kids the Presidents. I used song form, they loved it, I loved it...that's all that matters.
It took about a month but now I hear them singing it all over the place. We have only one rule regarding song a like this: you're not allowed to sing a single line or two repetitively, you have to learn the whole verse (and then you can sing the verse over and over but surprisingly that rarely happens). It's been pretty effective. Here is the song to help out those who might be interested. (I think many of you will appreciate it.)
https://m.youtube.com/watch?v=Vvy0wRLD5s8