@XHellChris singing breathy isn´t that safe, but in the course you can see he shows you how to lighten the sound and sound a little less chesty mostly in volume 2
Singing breathy is simply applying slightly less cord closure, so that you are always leaking a little bit of air, instead of using all of your air to vibrate the closed cords. Because more air passes over the cords, you need more air, and the cords get more dried out, and more quickly. Dry cords can lead to loss of phonation, so you sing harder to try to get sound out of the dry cords.
So use as little airy/breathy sound as you can, or deal with the consequences of trying to sing with dried vocal cords.
Singing breathy is simply applying slightly less cord closure, so that you are always leaking a little bit of air, instead of using all of your air to vibrate the closed cords. Because more air passes over the cords, you need more air, and the cords get more dried out, and more quickly. Dry cords can lead to loss of phonation, so you sing harder to try to get sound out of the dry cords.
So use as little airy/breathy sound as you can, or deal with the consequences of trying to sing with dried vocal cords.
Of course it makes perfect sense, not to mention less resonance, thus leading to a cycle of even more air in an attempt to cut through. But then how do people like Bryan Adams, Rod Stewart and Huey Lewis get away with it?
The 3 singers you mentioned have very gravelly voices, as in having nodules on their vocal cords. That's different from breathy singing, although, due to gaps in the cord closure because of nodules, there is a tendency to leak air through the cords.
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So use as little airy/breathy sound as you can, or deal with the consequences of trying to sing with dried vocal cords.