This dissertation rationalizes the best use of Web-based instruction (WBI) for teaching music theory to private piano students in the later primary grades. It uses an integrative research methodology for defining, designing, and implementing a curriculum that includes WBI. Research from the fields of music education, educational technology, educational psychology, and interaction design and children receive primary consideration. A synthesis of these sources outlines several research-based principles that instructional designers can use to design a complete blended learning environment for use within the piano studio. In addition to the research-based principles, the precise methods of determining instructional tasks and implementing the program online are described in detail. A full implementation is then deployed, and piano teachers evaluate the extent to which the online program fulfills the research-based principles. This dissertation does not argue for the complete migration of theory instruction from traditional workbook approaches to an entirely Web-based medium but rather outlines the best use of face-to-face instruction, collaboration amongst students, teachers, and parents, and interaction with a Web-based program. This formative research provides a complete model of integrating WBI within the piano studio that can guide instructional designers and music educators.