Composed in 1800 and published as a #Grande Sonate#, Beethoven#s Piano Sonata in B-flat major Op.22 marks the end of his first creative period. The only surviving handwritten source is a copyist#s manuscript that served as an engraver#s copy but which conflicts in many details with the original print. Beethoven held this sonata in especially high regard, proudly calling it #a real challenge# in a letter of 15 January 1801 to his publisher Franz Anton Hoffmeister. Indeed, it manifests the quintessence of classical formal principles: its proportions are balanced, its four-movement structure consummately designed. It poses high demands on flawless technical brilliance and lightness of execution. For his new Urtext edition the world-renowned Beethoven scholar Jonathan Del Mar has examined meticulously all available sources and presents a reliable musical text. The elegant layout and advantageous page turns further add to the quality of the edition which also includes a detailed Critical Commentary, an informative Preface, and indispensable information on performance practice (ties and slurs, dynamics, accents).