In April 1764, Wolfgang Amadeus Mozart, then aged eight, arrived in Britain with his family as part of their grand tour of Europe and remained until July 1765. The Mozarts were summoned to court on 19 May and played before a limited circle from six to ten o'clock. Johann Christian Bach, eleventh son of the great Johann Sebastian Bach, was then music-master to the Queen. He put difficult works of Handel, J. S. Bach, and Carl Friedrich Abel before the boy: he played them all at sight, to the amazement of those present. Afterwards, the young Mozart accompanied the Queen in an aria which she sang, and played a solo work on the flute. On 29 October, the Mozarts were in London again, and were invited to court to celebrate the fourth anniversary of the King's accession. As a memento of the royal favour, Leopold Mozart published six sonatas composed by Wolfgang, known as Mozart's Opus 3, that were dedicated to the Queen on 18 January 1765, a dedication she rewarded with a present of 50 guineas.