 Pieces of music, or performances of them, are standardly said to be happy, sad, and so on. Music’s emotional expressiveness is a philosophical problem since the paradigm expressers of emotions are psychological agents, who have emotions to express. Neither pieces of music, nor performances of them, are psychological agents, thus it is puzzling that such things could be said to express emotions. One immediately helpful distinction is that between expression and expressiveness, or expressivity. Expression is something persons do, namely, the outward manifestation of their emotional states. Expressiveness is something artworks, and possibly other things, possess. It is presumably related in some way to expression, and yet cannot simply be expression for the reason just given.