Mozart's keyboard works for four hands feature among the most delightful and entertaining of his compositions. Indeed, a favourite family pastime was to play duets on a harpsichord or pianoforte. The young Wolfgang and his sister Nannerl apparently spent many happy hours playing together on the same keyboard. This we learn about from the English music historian and traveller Charles Burney reporting in 1772 : «By a letter from Salzburg (…) I am informed that this young man, who so much astonished all Europe by his premature knowledge and performance, during infancy, is still a great master of his instrument. My correspondent went to his father's house to hear him and his sister play duets on the same harpsichord.».