Allegri’s Miserere for 2 choirs used to be performed in the Vatican only once a year. The composition was carefully guarded, it was prohibited to copy it, and it was kept secret for almost 150 years. All this happened until a 14-year-old Mozart heard it once, wrote it down by ear and presented the composition to his sister Nannerl.

When the Vatican found out about it, they were astounded by how exact the copy was and Mozart was awarded the Order of the Golden Spur by the Pope himself.