Music is broad subject.
In its strictest sense, it is the organization of sound over time. The organization of silence and noise.
In the freest sense, it is the expression of something that cannot be expressed otherwise. Music is there to describe feelings, ideas, and happenings, in a way that words do not.
When I teach music, I teach to both of these ideas. For without the need to express, we would not have made music or art. And without the organization, we would just be making noise.
This year, we have started a band and choir program. In these classes, students will learn about music, either; by using instruments to do so, or by learning to use the oldest instrument of all. (The human voice.)