Hey dude — Elvis Costello *can* actually sing his ass off. He sings in genre-stylized ways, but he has a hell of a lot of voice control. Don’t believe me? Listen to him nail “This House is Empty Now” and then put on “Good Year for the Roses.”
It takes more energy to move a low tone at a normal volume than to produce a higher tone at the same volume. What you are hearing is a relative phenomenon, and results from you applying force (breath force, with resonance in your diaphragm or your head, it doesn’t matter) *evenlly* across your range. To smooth it out you have to reduce the energy at the higher end of your range, or boost it on the bottom, or else move or reshape the primary resonance point as you go up your range to compensate. Generally, the former (backing off on pressure as you go up) is preferable because of the high likelihood of stridency (various kinds of noise) in higher frequency vocalic sounds. Best way to learn about this is to try some lessons on a brass instrument. It gets clear fast.
Or, as Nonane says, you can just sing Balkan music, or something else that parts the voices in such a way that you don’t have to exceed the sweet spot in your vocal range.
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