The book follows the activities inherent in music editing, including the tasks of the editor, the nature of musical sources, and transcription. Grier also discusses the difficult decisions faced by the editor such as sources not associated with the composer and necessary editorial judgement.

The Latin liturgical music of the medieval church is the earliest body of Western music to survive in a more or less complete form. It is a body of thousands of individual pieces, of striking beauty and aesthetic appeal, which has the special quality of embodying, of giving voice to, the words of the liturgy itself. Plainchant is the music that underpins essentially all other music of the middle ages (and far beyond), and is the music that is most abundantly preserved. It is a subject that has engaged a great deal of research and debate in the last fifty years and the nature of the complex issues that have recently arisen in research on chant are explored here in an overview of current issues and problems.

The fifteen studies assembled here grew out of research on south-Italian ordinary chants and tropes for the multi-volume series Beneventanum Troporum Corpus II, edited by John Boe in collaboration with Alejandro Planchart. In the present essays, clerical and ordinary chants and tropes of the Mass (especially when derived from paraliturgical hymns and poems), certain aspects of chant notation and particular facets of the old Beneventan and the old Roman chant repertories are examined in relation to the three main cultic centres of the Italian south - Benevento, Montecassino and Rome - and as they relate to their European context, namely Frankish and Norman chant and the varieties of chant sung in Italy north of Rome. The volume includes one previously unpublished study, on the Roman introit Salus Populi.