At the age of two, Mozart could hear sounds and tell what pitch they were. There is a story that he heard a pig oink and yelled “G-sharp!” Someone duplicated the pitch on a piano, and discovered that it was indeed G-sharp.
Mozart started playing the piano at age three but not formally until age four. It was his choice. He started interfering with his sister’s lessons so he could learn more. By age four he could learn a minuet within 30 minutes!
Mozart’s full name was Johan Chrysostom Wolfgang Theophilus Mozart. Amadeus was just what people called him. His father called him Woferl.
One of Mozart’s tricks, which he performed from the age of six, was to cover a keyboard with cloth so that the keys couldn’t be seen, and then play music perfectly anyway.