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A genuine yodel is one without words, not really 'music,' but acoustical signals, most often associated with cowherds communicating with one another and their herds from mountain to mountain.
This is far-fetched because yodeling and the domestication of grazing animals predates the invention of the alpenhorn.
Still others believe the origin of the yodel is the human soul; as a psychological reaction to the breathtaking scenery surrounding the cowherd -- yodeling's wide leaps of high and low notes evoking the exalted hills, the awe of the human spirit.
Yodeling (or yodelling) is a form of singing that involves singing an extended note which rapidly and repeatedly changes in pitch from the vocal chest register (or "chest voice") to the head register (or "head voice"), making a high-low-high-low sound.
Yodelling is one of the most developed uses of this technique, wherein a singer will switch between these registers several times within the same note, at a high volume.
Yodeling is less often seen in pop music and rock, probably because there is not much of an accompanying tradition of its use.