In this study, the subject of music and musical instruments has been studied with a project-based approach and a practical training program has been organized in a kindergarten classroom. This paper describes a semester long curricular and instructional design project focusing on the design and implementation of a Music Down Here Project using Project Based Learning approach into a kindergarten classroom. The project took place in a university-affiliated child care setting in the Midwestern United States. The classroom had one classroom teacher, one teaching assistant, and 16 kindergarten students (10 girls, 6 boys). The project was performed in three stages and the topic of musical instruments was selected by the children participating in the project. In this study, activities were planned in line with the interest of children towards musical instruments. According to the findings of the study, the students’ interest towards musical instruments increased as a result of the project. The project-based learning approach positively affected children's cognitive development about music and musical instruments. The project itself offered several opportunities for parents to get involved in children’s education. It is suggested that preschool teachers might be encouraged to design and use project-based learning approach in their lesson plans.