This collection addresses the need for accessible, modern-notated versions of traditional Gregorian chants for contemporary choral performance. John Rutter, a prominent composer and conductor, curates this selection to bridge the gap between historical liturgical music and modern choral practice. By providing editorial performance suggestions, the text serves as a practical guide for choirs seeking to incorporate these ancient melodies into their repertoire.

Music educators and choral directors frequently identify this collection as a standard resource for introducing unison choirs to the Gregorian tradition. Experts highlight the clarity of the modern notation as a significant benefit for ensembles lacking specialized training in neumatic notation.