He displayed marked musical gifts very early, playing the keyboard confidently when aged four, composing his first pieces for it aged five, and quickly mastering the violin. Leopold was keen to exhibit his son's extraordinary talents, along with those of his gifted pianist-daughter, Maria-Anna (called Nannerl) (1751--1829), and he undertook a series of tours across Europe with them when Mozart was just six years old.
In 1767 the family went to Vienna for five months, where Mozart wrote an opera buffa (comic opera) for the Emperor, La finta semplice (trans, the Pretend Simpleton); and a Singspiel (a German-language opera with some spoken dialogue), Bastien und Bastienne (1769), commissioned by Dr Franz Anton Mesmer. However, in Vienna, the Italian musicians at court, including the composer Antonio Salieri, made it difficult for him to produce his operas. He returned to Salzburg, and was appointed honorary Konzertmeister to Archbishop Sigismund von Schrattenbach.
There followed three extended visits by father and son to Italy (1770--2). Musical experience gained on these tours helped mold Mozart's style, especially in dramatic music. He was prolific, writing sacred vocal pieces and instrumental works too. By 1772 he had written about 25 symphonies (some are lost), and his first quartets. Further quartets and symphonies followed during and