Motown Raspiness

Hello,
Marvin Gaye has a noticable raspiness to his voice that I've also noticed in many other male Motown singers. It doesn't sound like belting to me. Is this a technique or does it have to be in your voice naturally?
Marvin Gaye has a noticable raspiness to his voice that I've also noticed in many other male Motown singers. It doesn't sound like belting to me. Is this a technique or does it have to be in your voice naturally?
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which i imagine these guys would have done a whole lot of