i asume you're asking about musical artists and music in general, and not specifically talking about singers... Or are you specifically talking about people who sing?
kinda tough to measure the increasing maturity of a voice over time. Surely you're thinking lyrics, musicianship etc. in addition to vocal skill, right?
If you're only talking about vocals, I guess Kanye and Apex Twin (as well as Fugazi and Unwound, since they're bands, not individual vocalists) are pretty much off the table. If that's the case then... Tom Waits. I guess. I dunno.
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