Motor imagery can be defined as the covert cognitive processes of imagining a body movement without actually moving the body. It has been shown that motor imagery can be effective in optimizing the execution of movements in athletes and accelerating neurological rehabilitation in stroke patients. Several famous pianists have reported frequent use of mental practice, which facilitates performances without spending physical energy. In addition to the finger movement, another kind of motor imagery involved in instrumental performance may be covert humming, which is expected to elevate performers' musicality. This paper discusses the importance of motor imagery for music performance and reviews the relevant evidence from neuroscience. We argue that a better understanding of these novel findings may be of value for the improvement of music education practice.