MetalDestroyer
Heaven's Football Bat
Insomnium's bassist handles the growls, the guitarist the cleans. I dare anyone to say that it doesn't work.
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Your analogy is only valid if the two vocalists are stylistically close enough to be equivalent. Otherwise a more apt analogy might be writing music that has parts for saxophone and piano, but deciding that the pianist should just play both parts. Completely different result.
The Beatles had four frontmen.
dude, styx, nuff said.
In mastodon all sing but Bill really only does live background vocals or growls.