Does anyone have ideas for songs to play in the classroom?

We tried using the song "Fireflies" by Owl Moon (with lyrics, without lyrics) as an auditory timer while we were cutting out our word sorts and it worked like a charm. There seemed to be less chatter, more quiet focus. The task was also completed faster compared to when we just put our online timer up on the screen during the previous week.

One final benefit: There is something eerily peaceful about listening to people whispering along with a song like this.

I'd love your suggestions if anyone has any...