This work investigates the structural and liturgical requirements of the Missa Brevis form within the context of 20th-century choral composition. William Mathias, a prominent Welsh composer, utilizes his expertise in neo-classical and modernist harmonic languages to provide a concise yet rigorous setting of the Latin Mass. The work serves as a practical liturgical resource while simultaneously functioning as a study in economy of musical expression. By stripping away the expansive orchestration of traditional masses, Mathias focuses on the interplay between vocal lines and rhythmic vitality.

Musicologists and choral directors frequently cite this work as a standard example of efficient, high-quality liturgical composition. Experts highlight the accessibility of the vocal writing for amateur ensembles while noting the sophisticated harmonic language that defines Mathias's broader body of work.