Musical Offering
From Tardis Wiki, the free Doctor Who reference
The Musical Offering was a collection of compositions created by Johann Sebastian Bach in the mid 1700s.
One of the greatest suppporters of the Star Chamber outside of England was the King of Prussia, Frederick II. He was a patron of Bach, and had him compose the Offering as a method of gaining access to the Eleven-Day Empire.
Upon completion, though, they realised that the technology of the time was unable to properly utilise the Offering. It would take another century for that technology to be available in the form of Charles Babbage's analytical engine.
One of the pieces of the offering, the canon per tonos, was decoded first and was used as a sort of skeleton key to unlock the rest. (PROSE: The Book of the War)
