Throughout the book the word psalmody is used in reference to music, 'hymn being applied to words only. It has been found necessary sometimes to repeat certain facts and statements with a view to making each chapter complete in itself as far as possible. One difficulty that confronts the would-be student of psalmody is to discover the where abouts of some of the rarer psalters and collections. I have given a list of the unique works referred to in this volume, with the locality of each, and trust it will be found useful.