Gradus ad Parnassum the art of playing the piano. This book, "Gradus ad Parnassum the art of playing the piano. Book 6", by Muzio Clementi, is a replication of a book originally published before 1898. It has been restored by human beings, page by page, so that you may enjoy it in a form as close to the original as possible. This book was created using print-on-demand technology. Thank you for supporting classic literature.