Mine is the first two lines to the song "I'm a little teapot" because my town's name is Teapot. I was thinking about changing it to "Polly put the kettle on" but it would seem a little strange because I'm so used to my town tune.
Ahh I'm not sure what the actual notes are off the top of my head, but mine is part of the theme from Howl's Moving Castle!
It sounds really neat when you go in and out of buildings and it plays super fast xD