Even there my free home is;
There watch I the flocks
Wander white as the foam is
In stairways of rocks.
Secure in the gorge there
In freedom we sing,
And laugh at King George, where
The eagle is king.
—Song. T. B. Read.
The reason for low pitch or high pitch is psycho-physiological. Nerve tension means muscular tension, and, since the muscles controlling the vocal chords are subject to the same laws as the other muscles, the greater the tension the higher the pitch. Hence, since what we have called the controlled states are accompanied by relatively low muscular tension, it necessarily follows that they will be expressed in relatively low keys.