This was sent to me... I thought it was a very cute, melodic song about learning circle-related terminology such as radius, diameter, and circumference, and the two formulas with Pi (area formula and circumference formula):
Here's a direct link in case you want to spread it around:
http://www.youtube.com/watch?v=-z4SUypJZxo
This is done by Dave Mitchell who also has a website Arithmecode.com.
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