Easy now, some day this kid will discover music beyond Slipknot and all will be well.
...Or he'll continue liking Slipknot and never progress past the age of 16, complete with parent hating angst and shitty "90's" style metal....although I don't think he's old enough to remember that craze. Stock up on Limp Bizkit and Korn!
well if you like slipknot then I might suggest: Newer In Flames stuff, Caliban, Bleed the Sky, Dead to Fall, Source of Tide, Nodes of Ranvier, Arise, Baal, Heaven Shall Burn, Centinex and of course Mudvayne, Demon Hunter, and ill Nino for your nu metal needs.
Yeah, Heaven Shall Burn FTW!!!
Also, Unearth, maybe some older As I Lay Dying, At the Gates, Bridge to Solace, Himsa, Killswitch Engage, Maroon, Misery Signals, Neaera, Trivium...
And maybe some Machine Head for something more new metallish
Let us take everything from each other;
let us take everything from ourselves.
Let the poles work and reject cold dirt,
steal away from me the godlike spark,
and slam in the smile from my disgusting visage.
And let the steel be buried in my billowing flesh;
which wanders this world in the useless nothing
With a sterile look on life and all that it is;
we wait for the holy executioner.
He who approaches mercilessly to perform his blessed works..
My punishment fell early and without mercy,
and the same sentence will fall to the ones without faith.
In this my shadow-self finds comfort, and sadistic pleasure
in that we all will be caressed by the tender love of the flame
Haha, I was going to recommend:
Slayer
Children of Bodom
Death
3 Inches of Blood
Sepultura
Celtic Frost
Exodus
Regurgitate
Hm, I don't listen to nearly as much metal as I used to, so I can't really think of any. But you should check out Metal: A Headbanger's Journey (documentary) that definitely will give you some recommendations!
Winds of Plague
Sea of treachery
whitechapel
Through the Eyes Of the Dead
Bring Me The Horizon
As Blood Runs Black
The Absence
Beneath the Massacre
Born of osiris
Dance Club Massacre
Enter Shikari
The Human Abstract
In Fear And Faith
Liferuiner
Opeth
Pantera
Suicide Silence
Bookmarks