The gregorian modes

In a first section, there are numerous tables explaining the main aspects of the problem. These charts can be studied independently or as a whole, and they are based on the life-long studies of Dom Jean Claire. The second section, called the Gregorian octoechos is a detailed investigation of each one of the eight Gregorian modes. Much of this part is based on the studies of Father Jean Jeanneteau ( 1992), canon regular,. His highly original and personal notions on the ethos of each mode are cited extensively.