The last cantata

In the original score of "Musical offering, Bach created by order of Frederick the Great, contains an error. It was universally acknowledged.
But we know that Bach scrupulously the rules of their scores...
It is also known that the mysterious death befell the great composers who studied in this work - Mozart and Webern...
Student at the Paris Conservatoire Leticia, Forzza sure it is not an error, but about the mystery encoded in the music and brings death to anyone who tries to expose her.
And cost Leticia to study the mysterious musical score, as people close to her begin to die one by one...