Mine is Rock and Roll All Nite by Kiss. It's too many notes, so I had to cut off the start, but it's pretty cute hearing Lolly (and the others) going around singing that song.
Mine is a snippet from a Polish folk song that I learned as a child.
It's very catchy and upbeat, so I think it fits the character of my town pretty well - I'll see if I can get a picture of the screen later.
If anyone's curious, the song (intended for children) has to do with a dancer marrying a man carved from wood, and then creating children from wax.
Oookay, that sounds A LOT creepier in English.
Mine is the Harry Potter theme link to the video I got it from down below. It's in a lower pitch in my town, but still the same idea. https://www.youtube.com/watch?v=y9S6Vl2pqJw