Okay, in my opinion their music is much more better than that Justin Bieber or music that is in the Billboard right now. I think their music is like the zenith of true creativity. I think they made the best brand of music in the 2000's the same with Linkin Park and Evanescence. Their lyrics are also well - written. I am wondering why they are not famous because their art or music should not remain underground. I am aware they don't adhere to basic song structures. Their single song can last up to 10 - 17 minutes long and they growl more than actual singing. But that should not be the reason or factor that they are not hitting No. 1 in the charts. They deserve more than that.
This band is not making mostly through - composed randomness and growling and screaming all the time. They actually created music that is actually beautiful and fantastic to listen to. Check out this links and you'll see what I mean.