Composition (Music) -- Instruction and study -- Early works to 1800. : A compendium [electronic resource] : or, introduction to practical musick in five parts. Teaching, by a New, and Easie Method, 1. The Rudiments of Song. 2. The Principles of Composition. 3. The Use of Discords. 4. The Form of Figurate Descant. 5. The Contrivance of Canon. By Christopher Simpson.