Michael Blake from Portland Oregon took the digits of pi, translated them to notes, and wrote a simple melody he posted on YouTube. He is now being sued by another composer, Erick Larsen of Omaha, who claims that only he has the right to record pi music.

A few more links on the story:

http://www.npr.org/2011/03/14/134492882/how-to-transform-the...

http://www.coetail.asia/jenanderson/2011/03/27/pi-fight/

and the legal case filing: http://dockets.justia.com/docket/nebraska/nedce/8:2011cv0012...