Lamb of God? Really? You call all that screaming music?
Screams are as screams do ... stop me if I'm getting too technical.
And yes, I call it a form of music. No more 'unmusical' than, say, the Bieber creature, who sounds like perfect manure in my ears, but apparently to large sections of the population, his wailing is panty-soaking good and $$$$$ friendly.