https://music.stackexchange.com/questions/50393/how-to-rough-sing-at-quieter-levels
Singing “roughly” has several different meanings, and I don’t know which you mean.
In general, singing roughly can be accomplished by pulling down on the vocal tract above the larynx. In another word, when one’s angry or sad, the entire vocal tract is pulled down slightly, and this produces a rougher sound.
The reason this causes loss of high range is because when pulling down on the vocal tract, the sounds are blocked off, quite a bit by the pulled down muscles, this methodology is more difficult for the vocal tract, and upper resonant cavities are blocked off.
To achieve AC/DC requires: 1. a very high tenor voice or 2. very capable control of the entire vocal tract, including excellent control of the head register resonant cavities. If you’re voice is naturally #1, this will simply lots of practice. If you want to learn via #2, this takes a lot of work.
If you mean, by rough highs something else…..
Highs can be achieved with volume by great resonance. All one has to do then is to roughen up the vocal tract a bit by throwing in some grit. But achieving great upper register resonance takes some special knowledge.
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