Mozart

Wolfgang Amadeus Mozart was born to Leopold and Anna Maria Pertl Mozart at 9 Getreidegasse in Salzburg, capital of the sovereign Archbishopric of Salzburg, in what is now Austria, but then part of the Holy Roman Empire. His only sibling to survive past birth was Maria Anna (1751–1829), called "Nannerl". Wolfgang was baptized the day after his birth at St. Rupert's Cathedral. The baptismal record gives his name in Latinized form as Joannes Chrysostomus Wolfgangus Theophilus Mozart. He generally called himself "Wolfgang Amadè Mozart"[4] as an adult, but there were many variants. His father Leopold (1719–1787) was deputy Kapellmeister to the court orchestra of the Archbishop of Salzburg, and a minor composer. He was also an experienced teacher, and in the year of Mozart's birth published a successful violin textbook, Versuch einer gründlichen Violinschule.
Anonymous portrait of the child Mozart, possibly by Pietro Antonio Lorenzoni; painted in 1763 on commission from Leopold

When Nannerl was seven she began keyboard lessons with her father, and her three-year-old brother would look on, evidently fascinated. Years later, after his death, she reminisced:

He often spent much time at the clavier, picking out thirds, which he was always striking, and his pleasure showed that it sounded good. [...] In the fourth year of his age his father, for a game as it were, began to teach him a few minuets and pieces at the clavier. [...] He could play it faultlessly and with the greatest delicacy, and keeping exactly in time. [...] At the age of five he was already composing little pieces, which he played to his father who wrote them down.[5]