The Rosslyn Motet
 

http://heritage.scotsman.com/myths.cfm?id=627062006

This is fascinating and a little nutty:

"Mitchell doesn't believe that the notes were carved there simply to record a piece of music. He hopes that the repeated frequencies in the music will resonate within the building and unlock a medieval secret."

It says on Wikipedia that they're going to perform it in the chapel on May 18.

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