'I wish to do it to reflect the character of Mad:selle Rose,'' Mozart replied when asked how he intended to set out the Andante of his Sonata in C major. In autumn 1777 he had got to know Rosina Cannabich in Mannheim and during her lessons immediately introduced her to the Sonata K. 309 that he had composed for her. Indeed, in December 1777 according to her teacher she was already able to perform it ''excellently''. So that a great many other pupils might follow in her footsteps, we are now publ