 Hydra is an album by Within Temptation and contains guest appearances by an American metalcore vocalist best known for being the vocalist of what two bands?
Hydra (Within Temptation album): Hydra is the sixth studio album by Dutch symphonic metal band Within Temptation. Hydra (Within Temptation album):  The album contains guest appearances by singer Howard Jones (ex-Killswitch Engage), rapper Xzibit, metal vocalist Tarja Turunen (ex-Nightwish) and alternative rock singer Dave Pirner (Soul Asylum).
i don't know