And on Trivium's latest single Silence In The Snow, he can be heard delivering a more melodic sound, a pattern which is followed throughout the album of the same name.

Heafy tells Metal Hammer magazine that he hooked up with signing coach Ron Anderson after a recommendation from Avenged Sevenfold's M Shadows. He says: "Ron's taught Axl Rose, Chris Cornell, Janet Jackson - the list goes on.

"Not only has he helped my clean singing, but he's taught me a correct screaming technique, because what I'd been doing for 15 years was incorrect and I was on the brink of destroying my voice.