The elder Mozart’s genuine achievement resists measurement, not least because he sacrificed his own career to that of his two children. He corresponded with Gellert and was a friend of Wieland. Joseph Haydn told him that his son was ‘the greatest composer known to me either in person or by name.’ Kelly and Attwood visited him with a plan of his son Wolfgang’s for a trip to England, but it didn’t come off. In Paris Leopold made the acquaintance of Grimm, who arranged concerts for the Mozart family (father, daughter and son) and had them introduced at court.