The book represents an exploration of three Irish-language mass settings for the Roman Rite, two by Sean and one by Peadar O Riada, written from within the cultural context of the Gaeltacht of Cuil Aodha. In it the author highlights the significance of the achievements of both composers.

It presents an investigation into the liturgical music of Sean and Peadar O Riada through an examination of three Roman-Rite mass settings composed in the Irish vernacular from within the cultural context of the West-Cork Gaeltacht of Muscrai. The main part of the work, running from Chapters Three to Six, consists of a detailed analysis of the contents of the mass settings, a body of material which is considered from the following perspectives: as emanating from a living culture of native traditional song; as part of a historical continuum of monophonic liturgical composition for the Roman Rite, having at its origins the compositional traditions of plainchant; as part of a broader aesthetic context of text-music relationships found in the repertoires of plainchant, medieval song and folksong; and finally, as part of the new liturgical reality existing since the Second Vatican Council which requires viable and sustainable musical approaches to the setting of vernacular texts.