Franz Xaver Mozart was W. A. Mozart's youngest son. Intended for a career in music by his mother from the very beginning, he followed in his father's footsteps but was not able to step out from under his shadow during his lifetime. In our edition in two volumes (Volume II, HN 959) we are publishing all of his piano works for two and three hands for the fi rst time. Volume I contains nine, in part very extensive variation cycles (one of them is a first publication), an expansive Fantasia in A major (also a fi rst publication) and the Sonata op. 10 with four movements. A cycle of variations for three hands brings the volume to an original close.