Often a sign of getting older is when one notices policemen are beginning to look younger.

For music fans that feeling happens more swiftly - especially when there is a band like Iceland’s Mammut on stage at the start of the Icelandic Airwaves music showcase.

Their sound belied their youthful looks, locking together to provide impressive crescendos. Their combination of both harsh guitars and tinkling percussion to was a perfect backing to frontwoman Katrina Kata Mogensen’s distinctive vocals.

It’s another cliché to compare a female vocalist to Iceland’s biggest export Bjork – but with Mogensen the comparison is apt.

Similar to the former Sugarcubes frontwoman turned avant garde pal of David Attenborough, Mogensen’s voice was both tuneful and broken, descending into yelps and screams on occasion, as she effortlessly alternated between Icelandic and English.

And the blonde Viking had a similarly idiosyncratic approach to her image, sporting something which combined tweed and a silver cape over her shoulders, and a black ink circle around her throat which mesmerisingly changed shape every time she took a breath.

Between lines she was twitching and gesticulating, adding to the interplay of menace and lightness to the atmospheric music as captured on three albums over the last ten years.