After the art is attained in this formal way, ability to induce the same repose when sitting upright, or while standing, will be quickly developed.
This repose is the fitting preparation for a lesson or a performance and may be induced during the progress of either, to allay any trepidation incident to the situation.

A mastery of this simple art will make progress in the work of voice development much more rapid, and make attainable a degree of discipline that is impossible without it.

It will prove for the beginner a sure prevention of stage fright and a great relief to the most chronic sufferer from this malady.
THE VIBRATO The _vibrato_ is a rhythmic pulsation of the voice.

It often appears in untrained voices; in others it appears during the process of cultivation.

Some have thought it the perfection of sympathetic quality; others esteem it a fault.
The vibrato is caused by an undulating variation of pitch or power, often both.