The critical edition of The Correspondence of Muzio Clementi includes some 20 previously-unknown letters by Clementi himself, in addition to about 30 more that were written to him, his family or associates, or by those other individuals. Furthermore, many letters only previously referred to or partially quoted are published here in full, along with previously unknown passages found in new sources such as the notebook used by both Clementi and his grandson Herbert Clementi-Smith, now in the posse...