Sir Michael Costa, the celebrated conductor, was holding a rehearsal.  As the mighty chorus rang out, accompanied by scores of instruments, the piccolo player a little pint-sized flute thinking perhaps that his contribution would not be missed amid so much music, stopped playing.  Suddenly, the great leader stopped and cried out, "Where is the piccolo?"

The sound of that one small instrument was necessary to the harmony, and the Master Conductor missed it when it dropped out. The point? To the Conductor there are no insignificant instruments in an orchestra.  Sometimes …