 Several among the previous remarks jointly point to the necessity of better accounting for the distinction between events in the sounding thing and events in the surrounding medium. As for sounds, this distinction is consequent upon the distinction between two kinds of medium: the source medium (that is, the stuff the thing is composed of) and the medium proper or environment medium, surrounding the sounding thing, the one in which the hearer could be immersed as well. Let us take them in turn. First, a thing is a sounding entity only insofar the stuff or the stuffs the thing is composed of is or are vibrating. For a simple example, there are no properties of a tuning fork which account for its sounding, which are not properties of the stuff(s) the fork consists of (including shape). A more complex example is the case of the flute, in which the “sounding object” is air inside the flute. In both cases a portion of matter—the source medium—is vibrating.