If you're including this as part of a portfolio, I think you need a few (very minor) edits.
It's not something I would write (too mushy), but I enjoy your relaxed, semi-conversational style. It strikes me as very sincere. It's a nice piece. You might consider submitting it for publication.
I agree with the gist of the emphasis, too. Music and performing arts are about communication. (Theoretically, if students learned in PE classes what PE teachers claimed they were learning in them, that too would be at least partly about communication.) I'm not sure how much data is really available, but I know there has been some work done showing a correlation between musical training and mathematical ability. Further, as I mentioned previously, recent studies show our prisons to be populated largely with people who are not analytical learners, but kinesthetic learners who just might be reached by this. Not that you *should* necessarily mention these (and certainly not without looking into a bit yourself). I'm not really sure what my point is, except that these various mechanisms for communicating might be related - individually in our brains and collectively in our society.
I don't know. Anyway, thanks for submitting that. It's good.