'''six sonatas for keyboard with accompaniment of violin (or flute) and cello, K. 10-15''' were composed in late 1764 in London during the Mozart family's grand tour of Europe. Queen Charlotte of the United Kingdom commissioned them on 25 October and the works were dedicated on 18 January 1765.Sadie, Stanley, Mozart: The Early Years 1756-1781, p 86-87, Oxford University (2006), ISBN 978-0-19-816529-3 They were published as Mozart's "Opus 3".
Some manuscripts include an accompanying cello part where the cello part doubles principal notes in the left hand part of the keyboard. Because of this, there is some ambiguity as to whether to classify these pieces as violin sonatas, flute sonatas or keyboard trios.
It is likely the works were influenced by a set of similarly scored sonatas (Op. 2) by Queen Charlotte's music teacher Johann Christian Bach ("The London Bach"). Bach befriended the young Mozart and become an important influence on the younger composers evolving style.