In 1764 the eight-year-old Mozart wrote the Sonatas K. 10-15 in London. Leopold Mozart was only able to understand his son's musical genius in terms of it being a God-given wonder: “That my boy [...] knows all of this with his 8 years that could be expected of a man of forty years. In short: whoever has not seen or heard it, cannot believe it”. According to the title page the six sonatas can either be played as piano trios, violin sonatas or simply piano solo. As Henle has already published them in the form of piano trios and violin sonatas (HN 1078), they now present them in an Urtext edition for piano solo.