Shutter: This allows light to pass through for a determined period of time.
ISO: This measures the sensitivity of your sensor.
Aperture: Controls the amount of light reaching your camera's sensor.
An orchestra is defined as a large instrumental ensemble typical of classical music. An orchestra features bass, brass, strings, woodwinds, and percussions. In the list given above, the section that is not one of the four groups in the orchestral palette is the voices. The answer would be "voices".
