Gregorio Allegri - Miserere mei, Deus Piano Tutorial

"Miserere mei, Deus" is a piece written for two choirs by Italian Renaissance composer Gregorio Allegri. In the 17th century, there was a lot of mystery around it since it was only allowed to be performed in the Sistine Chapel! In 1770, Mozart famously wrote down the whole piece from memory after hearing it only once when he was 14 years old...