In music there is a phrase that must include all of the scales, most of the chromatic runs, part of the subquavers and be in its entirety, a single note that is not invasive to other instruments, does not bother the person beside you and offers the audience a break from the musical monotony. It's called a rest. when I was in school one of my freinds looked up to answer the question and said "Is that a nuclear explosion??" I just about fell out of my chair, I am waterborn you see, and when I enter into a landlubbers personal bubble, it throws me down like a sack of potatos.