""A Manual of Instructions on Plain Chant: Or Gregorian Music"" is a book written by James Jones and published in 1845. The book is a guide to the traditional music of the Catholic Church, known as plainchant or Gregorian chant. The author provides detailed instructions on how to sing this music, including proper pronunciation, intonation, and rhythm. The book covers a wide range of topics, including the history of plainchant, the different types...