Nordstrom produced Hammerfall's debut Glory To The Brave in 1997 and Dronjak says his involvement on (r)Evolution gave them "energy and hunger" in the studio.

Dronjak tells The Classic Metal Show: "I think the artwork and the fact we're working with producer Fredrik Nordstrom again helps to influence people before they even heard a note from the album.

"The album does have some kind of energy and hunger and attitude that we had on the first album that maybe we haven't been able to recreate since then."