inthenoosphere:

…the primary form of mathematical communication is not description but injunction… Music is a similar art form, the composer does not even attempt to describe the set of sounds he has in mind, much less the set of feelings occasioned through them, but writes down a set of commands which, if they are obeyed by the performer, can result in a reproduction, to the listener, of the composer’s original experience.

G. Spencer-Brown, Laws of Form