The application of constraints during the process of music composition can be creatively stimulating and directive. However, constraint is potentially restrictive when acting as restraint, stifling the spontaneity of musical idea or the instinctual flow of creative process. A creative folio at its core, this research examines how the application and consequent dissolution of constraints during the compositional process affect musical outcome. The dissertation presents an in-depth analysis of select folio works to illuminate how constraints were constructed and implemented, when and why rules were broken, and how this influenced musical outcome. The thesis then examines how use of constraints evolved over the course of the folio, reflecting on the concept of flow and creative process. The work evaluates how the application of constraints aides in resolving compositional problems as well as facilitating a state of flow during the creative act.