>>127379721 (OP)
He sang for a metal band.
They never went as pop as Metallica did.
So they stayed mostly in the niche of rock bands with a heavy sound.
It's very telling that they peaked on charts with a semi-acoustic album with some cool clay figurines video that was more appealing to the mainstream public.
If they stayed on that course or wrote a more tuneful song like Black Hole Sun, they would have become more popular. Also a lot of their music is very morose and downbeat, with sludgy riffs. Not so appealing for normies