Created and implemented as part of a school-wide STEAM initiative, this semester-long water conservation PBL combines science, music composition, computer programming, and entrepreneurship skills as students create and market musical playlists to be used while showering. In science, students develop models to illustrate the proportion of water available for drinking and discuss ways that these resources are over-utilized. Using EarSketch, a free platform that teaches computer coding through music remixing, students compose 2-minute musical pieces with lyrics that create awareness of the need to conserve water. The compositions are designed to be played during showering to limit the time of water use. To market their music, students create a music application and promote it and their playlist to the rest of the student body, in the process learning basic business principles such as copyright, collaboration, and Master Ownership. This innovative and collaborative STEAM PBL is great fun.