This paper presents the planning, execution and results of a 5-day musical instrument MAKErs camp for K-12 students. Students used various hardware sensors, a graphical programming environment and different physical prototyping techniques to create musical instruments. The design of a musical instrument introduces students to the full spectrum of the design process including form factor and function. Throughout the camp, students shared and performed in front of their peers to gain feedback as they iterated through the design of a musical instrument.