A Manual of Instructions on Plain Chant: or Gregorian Music is a book written by James Jones in 1845. The book is a comprehensive guide to the art of plain chant, also known as Gregorian music, which is the traditional music of the Roman Catholic Church. It includes instructions on the history and development of plain chant, as well as detailed explanations of the various types of chants, their notation, and their performance. The book also provides...