(1) Powerful overtones around 3000 Hz (the overtones of most instruments are not strong in this range). This is known as the "Singing Formant".
(2) Decibels: they just sing LOUD!
For comparison: you can vibrate like mad on a violin but this won't help you against a trumpet blowing straight high notes.
Michael Cook
At 16:56 -0800 19/02/2003, Richard Yates wrote:
Makes sense to me. Maybe, in a wide vibrato, such as is often (unfortunately) heard, the pitch is off key most of the time and that helps it stand out better among the on-pitch instruments.
At 22:48 -0800 19/02/2003, Mark D. Lew wrote:
It strikes me as very improbable that anyone would adopt a wide vibrato as a deliberate tactic to be heard over the orchestra. On the other hand, I can certainly see how the two are indirectly related, in that the general habit of singing with a big sound that will carry tends to encourage vibrato -- first because healthy full-bodied singing naturally results in a moderate vibrato which might sound "wide" to a listener accustomed to hearing a more controlled style of singing, and second because those opera singers who habitually oversing in an effort to give more than they've got will eventually experience weakening of their vocal musculature so that the vibrato widens prematurely as they age.
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