In this dissertation, I study four choral works by Dr. Zanaida Stewart Robles through musical, thematic, and theoretical analysis to synthesize her compositional style. In addition to analysis, I created supplemental educational guides for each piece. These guides are intended to facilitate an intentional teaching process that leads to meaningful performances that engage the community. I investigate Robles' intersectional approach to composition as it reflects her identity as a Black, female composer. This project contextualizes Robles' voice and her impact on 21st-century choral music. I selected four works for study—"Umoja," "No Fairy Tale Here," "Can You See?" and "Psalm 61"— to represent three overarching themes in her oeuvre: spirituality, mental health awareness, and social justice. This research provides greater insight into Robles' choral works and serves as a thought-provoking introduction to commissioning works from underrepresented communities.

In his Southern Harmony collection, William Duckworth extracts existing material from shape-note hymns found in William Walker's 1835 publication A Southern Harmony and Musical Companion. He then applies minimalist and postminimalist processes to this material to create innovation choral compositions. This document provides a comprehensive analysis of the methods used to construct all twenty works in Duckworth's collection by tracing the extracted source material through the fabric of the new compositions. This study provides substantial evidence of Duckworth's place as a pioneer of the postminimalist genre. It also provides a discussion on the vocal implications of utilizing shape-note hymns as source material as traditional performances of the genre are typically associated with a unique vocal style.