Although Haydn is said to have composed about 60 string trios, most of them must be discounted for source-critical and stylistic reasons. The eighteen trios which definitely lay claim to authenticity were published in volumes 1 and 2. The third volume contains eight trios attributed to Haydn, although his authorship cannot be proven. The musical text is that of the Haydn Complete Edition and it has been complemented by a new and informative preface by the Haydn scholar Sonja Gerlach.