The quiet instrument can determine the warmth of the whole arrangement.

The part you cannot pick out is often the part setting the temperature. Take it away and the whole thing sounds thinner without anyone being able to say what left. Prominence and influence are different measurements, in music and in most rooms of people. The loudest contribution is rarely the one holding the feeling in place.

Look at a group you belong to and find the person nobody names when they describe it. Consider what would actually be missing if they stopped. Then tell them, since quiet contributions go unmentioned by the very quality that makes them work.