S for Song

I’m just an open letter,
when you are barred as a sender.
I bring peace and violence.
Mostly, it is your mood.
I’m loud and subtle as one,
to your mind or your ears.
I’m high maintenance,
I demand heartbreaks.
I’m rarely in stage,
mostly behind closed doors and last page.
Oops! In exam hall too!
I’m neither music nor words.
I’m emotions.
I bubble wrap your soul,
so you can hit reality as a whole.
So, when I’m in a foreign language and
still, manage to sweat your eyes and light your bones,
I win, right?