... Two years later, when but twelve years of age, he composed the music for the religious service, and for a trumpet concert at the dedication of the Orphan House Church, in Vienna, and conducted it in the presence of the imperial court, in 1769, at the age of thirteen, he was appointed director of the Prince Archbishop of Salzburg's concerts; and in the same year travelled with his father to Italy, where he created an unheard of enthusiasm by his performances and compositions. He composed the Opera of Mithridates, at Milan, in October, 1770, and it was publicly performed there in December of that year. At the age of sixteen, he was the first clavecinist in the world; he had produced two requiems and a stab at mater, numerous offertories, hymns and motets, four operas, two cantatas, thirteen symphonies, twenty-four piano-forte sonatas, not to speak of a vast number of ...

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