With mixed reality (MR) becoming widely available, it could enhance learning because special equipment like musical instruments or access to instructors will be less of a concern. Furthermore, passive haptic learning systems to learn piano are promising research subjects. We combine both trends of MR and haptic learning to build a piano learning application. Through a study with diverse participants, we evaluate the piano application. The study results show the potentiality of the on-skin actuators and we hope our work could foster the future iterations of the actuators for a fun and effective learning environment.