This started when I was in grad school, but I haven't done it in a while. Near the end of the term, I ask my students to submit ideas for song parodies based on things we learned that quarter. Then I take the best idea, flesh out the lyrics, and record it in Garageband.
Here are the results:
• Winter 2014: Differentiable
• Spring 2012: Some Limit of a Ratio
• Autumn 2011: I'll Make arctan out of u
• Autumn 2010: Party in the US(x–a)