The first necessity in a paper of this nature is to offer some definition of the term ‘Mannheim concerto’. In the past there has been some tendency to view the musicians working at the Palatinate court during the reign of the Elector Karl Theodor from 1743 to 1778, and the last years of his predecessor Karl Phüipp, as a somewhat isolated school. It is clear, however, from the studies of Hugo Riemann and more recently Gerhard Croll, that not only did the orchestral personnel come from many different parts of Europe, including Düsseldorf, Innsbruck, Vienna, Bohemia and Italy, over a period of many years, but that they were also constantly leaving Mannheim for posts elsewhere, or else going on often lengthy concert tours, especially to Paris, which throughout the period remained the great centre of attraction for the Mannheimers in view of its important publishing trade and flourishing concert life, both public and private. In addition, the Elector, who in musical matters was certainly among the more enlightened and generous rulers of his day, was continually sending promising young musicians off on study tours to Italy to complete their musical education. Among such musicians can be counted Christian Cannabich, Johann Ritschel and Georg Joseph Vogler. Thus the musical contacts with the outside world were indeed wide, and it is often impossible to tell whether particular concertos were composed for Mannheim, Paris or elsewhere, especially as the Mannheim court music library has long since totally disappeared, and we now rely on the relatively few printed sources and the manuscript copies to be found distributed throughout Europe. For present purposes the term ‘Mannheim concerto’ will be taken to include all concertos by composers whose activities were centred for a substantial time at the Mannheim court, and will thus include the works of those such as Carl and Anton Stamitz, the sons of Johann, who spent their formative years within the Mannheim circle, even though they both left Mannheim in 1770.