least one of EVENT's directing agents. (In many cases,
            of course, EVENT will have only one director.)
            Non-performing directors typically control the actual
            performers by communicating instructions (or orders,
            commands, etc.) to them. For example, <a
            href="./doing-vocab.html#directingAgent">(#$directingAgent</a>
            PSOBicentennialConcertOfBeethovensNinth WilliamSteinberg)
            holds, because Steinberg was the conductor of that concer