The problem with which this investigation is concerned is the determination of compositional styles in terms of manners of employing monadic and dyadic intervals in the music of the common practice period. An aspect for determining style is proposed by way of comparing the frequency of occurrence of dyads and monads in selected musical examples from the baroque, classical, and romantic periods. Chapter I is a discussion of the problem and methodology of the study. Chapters II, III, and IV present analytic comparison of examples in the baroque, classical, and romantic periods respectively. Chapter V presents a summary of the findings with references to the pedagogical applications of the two-part framework principle.

Santa Eulalia M. Md. 7, dated January 20, 1600, is part of the San Miguel Acatán Repertory, which originated in the northwestern highlands of Guatemala and is presently owned by the Lilly Library of Indiana University. The manuscript contains thirty-four four-part songs and dances, two thirds of which are villancicos for Christmas, Easter, the Eucharist, and the feasts of All Saints and St. Michael. The remaining third consists of Latin biblical texts in either fabordón or contrapuntal settings, three pieces with Náhuatl texts, and an instrumental pavana. The thesis contains a modern edition of Santa Eulalia M. Md. 7 with critical notes and commentary, a comparison of the pieces with villancicos and fabordones of European origin, and a survey of several aspects of Mayan culture.