Coup de glotte

Coup de glotte or 'shock of the glottis' is a term used in the theory of singing technique to describe a particular method of emitting or opening a note by an abrupt physical mechanism of the glottis (the space between the vocal folds). During the 19th century there was disagreement among teachers and performers as to whether the technique should be taught as a normal part of vocal method or not. The technique is still sometimes used to achieve particular effects, dramatic or ornamental, but is usually avoided in the teaching of fundamental vocal method.

Tone production and vocal 'attack'

Vocal sound is produced by a column of air passing from the lungs through the larynx while the vocal cords or ligaments are drawn together, leaving narrow spaces through which the air passes in short, rapid pulsations or vibrations. The discipline of training aims to remove all rigidity and strain in the throat while governing the maximum economy of the ratio of breath to tone produced, so that a relaxed and pure tone may float freely on the breath, supported by the trained and elastic pressure of the diaphragm upon the lungs.