Hi Ken,
Well, Susan is right. The first example is a trill, not a particularly well executed one, but a trill none the less. The second just sounds like vib in various degrees of intensity. Sometimes as Susan also rightly said, a bit on the flappy side.
Now a trill is a very difficult ornament to achieve. Indeed, some would say you're born with a really good trill, and they may well be right. However, with practise, anyone can make it better. Jenny Lind in her treatise on singing gives an exercise taking two notes a semi tone and a tone apart and singing between them slowly at first and then speeding up. Very hard to do as you can jam up the instrument entirely. A better description is to use the old word for trill which was the shake. I think that gives a much more accurate description as to what the student may be trying to accomplish.
You have to be extremely relaxed to get a good trill. Any laryngeal tension and you've had it. In order for the trill to work, it's easy to imagine the voice/cords as a suspended body inbetween two elastic bands, a bit like a cat's cradle. When the two bands are twanged, the body in the centre of them bounces back and forth. This (in very simple illustration) is something like the action of the larynx when attempting a trill. It is literally bouncing up and down.
The other effect I hear is the different intensity vibrato. Well, many ways to achieve that. Increasing air pressure against the cords to let them blow apart will have a soft breathy pop vib that's quite slow for instance. Increasing air pressure and keeping the cords very tensed will produce a vibrant, strident and somewhat pinched sound. It's a question of taste and experimentation I think. Try various ways of doing this and see what happens. Remember, the more relaxed you can allow yourself to be, the better will be the end result!!
Just a few tuppence ha'penny worths for an old voice wrecker!!
Best to all.
Ian Voice wrecker to the stars.
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