Gregorian accompaniment; a theoretical and practical treatise upon the accompaniment of plainsong, by Louis Niedermeyer...and Joseph d'Ortigue...with an appendix containing: I. The various tones for the Psalms and Canticles, and for the Gloria Patria at the Introit; harmonized by L. Niedermeyer. II. Plainsong melodies in the eight modes, with examples of transposition, harmonized according to the principles of this treatise by Eugène Gigout...Rev. and tr. into English by Wallace Goodrich.
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