As the foremost representative of Czech music in 18th century Vienna, Leopold Kozeluch(1747–1818) was noted primarily as composer, pianist and keyboard teacher. His 50 keyboard sonatas cover his entire career and mark not only the transition from the harpsichord and clavichord manner to the fully idiomatic forte-piano style, but also the development of the “classical sonata“ which spanned several decades (from 1773 to 1809). Until now, pianists have had little chance to acquaint themselves with the complete range of Kozeluch’s sonatas since few existed in modern editions. For the first time this new complete edition by Christopher Hogwood presents all sonatas for keyboard solo. There will be four volumes in total and the works will be presented chronologically. Volume IV also contains those sonatas which are found only in manuscript sources.