Cristina Scabbia, 41
Band: Lacuna Coil
With her tousled mane of dark hair, mesmerising intense stare and lyrical Italian accent, Milan native Scabbia has no problems charming the socks off her legions of male fans.
The frontwoman of Italian gothic metal outfit Lacuna Coil, who is currently dating Slipknot guitarist Jim Root, has also powerhouse soprano vocals to boot. She has done duets with Megadeth, Alter Bridge and Apocalyptica.
Angela Gossow, 38
Band: Arch Enemy
If you happen to be listening to Gossow's screams and growls for the first time, you'd be hard pressed to believe that she is female.
The German blonde frontwoman of Sweden-based melodic death metallers Arch Enemy seems to conjure up seething rage and angst with effortless ease.
After she joined the band in 2000, replacing their original male vocalist, the quintet have gone from strength to strength.
Sharon Den Adel, 39
Band: Within Temptation
Boasting elegant, model-like looks, Den Adel, the lead vocalist of Dutch symphonic metal group Within Temptation, could easily be mistaken for an actress or classical musician.
She and the band's guitarist, Robert Westerholt, form one of the most enviable duos in heavy metal. Though never married, the life partners have three children together.
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