I'm creating a key NPC for my campaign who uses Heavy Metal as the basis for his own magical tradition. Now, I've been tooling around with the stylistic aspects of it for a while, but when I recently played Brutal Legend, I reworked it a little. Still, I'm not entirely happy with it, so I'm throwing it up here for some feedback in nailing it down.
Concept: The sounds and themes of Heavy Metal speak to the soul and call through astral space to the spirits. Through the elements of Metal, Noise, Blood and Fire, the modern bard can unleash the power of the beast within.
Combat: Fire (Fire)
Detection: Beasts (Beasts)
Health: Guardian (Noise)
Illusion: Man (Blood)
Manipulation: Task (Metal)
Drain: Willpower + Intuition
Like I said, I'm not happy with this, specifically the spirits. Help me, Jackpoint members, you're my only hope.

EDIT: Conceptually, certain mentor spirits can work really well for this tradition. Adversary, Artificer, Bull, Dark Goddess, Dragon, Sky Father, Dark King, Dragonslayer, Firebringer, Seductress and Wise Warrior all fit due to Metal drawing much of it's symbolism and themes from European legends.