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| | Singing - Wikipedia, the free encyclopedia |
 | | The human voice is usually considered to have at least three voice registers; ranging from lowest to highest, they are the chest register, head register, and falsetto. |
 | | Yodelling is a technique that requires rapidly switching between at least two different registers many times in the same phrase, producing a distinct high-low-high-low sound. |
 | | Vibrato is a technique used by singers (and many instrumentalists, for instance, string instruments that are played with a bow can produce vibrato tones) in which a sustained note actually wavers very quickly and consistently between a very slightly higher and a lower tone, giving the note a slight quaver. |
| en.wikipedia.org /wiki/Singing (559 words) |
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