Miserere Mei Deus (Have mercy on me, O God) is the mysterious composition written by Gregorio Allegri, during 1630s. It’s notes were hidden by Vatican for nearly 150 years to preserve it’s mysticism. They only played it in Sistine Chapel in this time until 14 years old Mozart arrived to Rome in 1770. He visited the Sistine Chapel, only listened it one time and wrote the whole notes down to paper. With his genius, a century long secret has been solved and it’s released after a year of 1770.