Technique
All human voices are considered to have at least two distinct vocal registers, called the "head" and "chest" voices, which result from different ways that the tone is produced. Most people can sing tones within a certain range of lower pitch in their chest voices and tones within a certain range of higher pitch in their head voices and spring into their falsetto (an "unsupported" register forcing vocal cords in a higher pitch without any head or chest voice air support). In untrained or inexperienced singers, a gap between these ranges often exists, although more experienced singers can control their voices at the point where these ranges overlap and can easily switch between them to produce high-quality tones in either. Yodelling is a particular application of this technique, wherein a singer might switch between these registers several times in only a few seconds and at a high volume. Repeated alternation between registers at a singer's passaggio pitch range produces a very distinctive sound.
For example, in the famous "Yodel - Ay - EEE - Oooo", the "EEE" is sung in the head voice while all other syllables are in the chest voice.
The best places for Alpine-style yodelling are those with an echo. Ideal natural locations include not only mountain ranges but lakes, rocky gorges or shorelines, and high or open areas with one or more distant rock faces.
Read more about this topic: Yodeling
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