Logier's system of the science of music, harmony, and practical composition This book, "Logier's system of the science of music, harmony, and practical composition", by Johann Bernhard Logier, is a replication of a book originally published before 1800. 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.