The purpose of this study is to present a case on blended learning that can be utilized for high school music classes and to explore the objective and future direction of high school music courses. It designed a project music class that compromised the procedure of blended learning using the ADDIE model, and then conducted five courses for the first grade focusing on the life area and for the second grade focusing on the expression area, respectively. After class, teacher self-assessment and an open-ended student survey were conducted. The results of the case study are: first, a well-designed blended learning class can expand the scope of music classes by reinterpreting the curriculum’s achievement standards. second, adopting blended learning is very important for people to be in line with the direction of future education of everyday art both online and offline. And third, most students positively evaluated the project music classes that were done either offline (in class) or online (interactive distance learning) biweekly.