Heavy Metal Tracks Sought for TV Series

A music supervisor is seeking riff-heavy, powerful heavy metal tracks for a TV placement. Songs should be original, intense, and thunderous. We want well-written lyrics and tight, professional performances. Broadcast quality recordings are a must! No samples, no virtual instruments. We want real heavy metal that is written and performed by real heavy metal bands. Various subgenres are okay, but we are really looking for something closest to thrash metal.