A specialization of both audible sound and information bearing wave propagation. Each instance of sound information bearing thing is an sound which is audible by, and thereby capable of providing information to, an Agent. (This information need not necessarily be in propositional form.) This collection does not include InformationBearingWavePropagations that require the use of some sort of electronic device to be rendered in the form of audible sound; thus radio wave is not a specialization. Genuine specializations include music and animal utterance. Note that, despite the use of the word `Thing' in the name of this constant, it refers to the sound alone, not to the thing that makes the sound (e.g. if one's CD player is pumping out music, the sound information bearing thing is the music, not the player). Thus, no one thing can be an instance of both sound information bearing thing and visual information source (e.g.).