Many people say that a voice is not an instrument. Well we read notes just as any other person who plays any instrument. We can keep rhythm, we can reach pitches with our voices, and not have to rely on some piece of wood or brass. In a way my voice is an instrument. I  may not have to use my arms, but that does not mean that I am not an instrument. Why am I going to judge on what a musical instrument is; when really a musical instrument is really meant to make sound. And that is what i do, I make noise with my mouth.