"It's always a good time" by Owl City. At Christmas it was "Do you wanna build a snowman?" from Frozen and at Halloween the Michael Myers "Halloween" theme.
I found a town tune of "Safe and Sound" which I thought was cool, so that's my town tune at the moment!
Although I did make a variation on the Harry Potter theme - I saw someone else's take, but it bugged me that they didn't include the first low note in Hedwig's theme. Maybe I'll switch over to that in the fall.
Mine's For the First Time in Forever from Frozen! I saw it on the New Leaf tag on Tumblr and just had to try it out. The person who made it also had Let it Go, but For the First Time in Forever sounded a lot better. It's so cute hearing my neighbors whistle it ;w;