jrb, you have absolutely no idea what you're talking about.
Vocal sound, that we perceive as one long sound, is actually successive puffs of air, 261 puffs of air per second at middle C and 1,000 per second at soprano high C. What we hear as vibrato is the natural oscillation of the vocal folds when the proper amount of air pressure and tension, correct tension, exist.
A cello, obviously, doesn't have vocal folds so one would have to force "vibrato".
*edited to be clearer and pwn harder*
Updated On: 7/2/08 at 01:21 PM