There are many songs about Pi number (you know, the one we use to compute the length of the circumference of a circle).
A very good one "Mathematical Pi" (resembles the famous song "American Pie").
Here is it (with lyrics), for if you are curious.
Well, if anyone dares to learn it by heart, he can do it instead of the "volunteer work"
Also, a Spanish Maths teacher has composed a song with the first 150 digits of number Pi.
I guess everyone knows it is an irrational number, so there is no group of numbers repeating recurrently in this song.
Very hard to learn! and no chorus!
Lyrics are in Spanish. Here is the video