You may have noticed that the link to the musical interpretation of pi I shared on Pi Day (3/14) is broken.  This is because someone else had already written a composition using the first digits of pi and copyrighted that composition.

Now, if Michael Blake, who created the composition Itried to share, had used the exact same rhythm as the previous composition (which I doubt), I would understand the copyright claim.  But pi is a number--how can it not be in the public domain?  Well, we can still write the first digits of pi, and we can say them, but if you want to use them to create a song by numbering the notes of the scale, you can't.  It's copyrighted.