A wide vibrato (the "wobble" of an over-used voice) is not necessary in order to be heard over the orchestra. Some of the greatest Wagner singers have had relatively small vibratos (listen to old recordings of Kirsten Flagstad or Birgit Nilsson). It's true that the vibrato of these singers is still more pronounced than that of a string player, but I don't think this is the main reason that they could be so easily heard. The vibrato may help to distinguish the sung sound from the orchestral sound, but the main reasons for a singer being heard above the orchestra are:

(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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