Go to watch Scottish postrock five-piece Mogwai play live and it’s usually an introspective affair. There is little crowd interaction and barely any vocals.

The epic experience is made for head-nodding, which is exactly what the band’s four guitarists tend to do as they build an ear-splitting wall of sound.

After more than 15 years together, the group are as noisy as ever. They have a new record out, Hardcore Will Never Die, But You Will, which adheres to, even progresses, the apocalyptic theme.

Fittingly, it was written by the Glaswegians individually – rather than as a group in the rehearsal room – using Apple Logic or via emailed MP3s, to echo that live approach.

“We’d build on the songs individually then all get together in Glasgow and a lot of the parts would nearly be finished,” says Barry Burns, the piano playing flautist who joined the band just before they recorded second album Come On Die Young, released in 1999.

“There is not as much wasted time in my opinion,” he adds.

“It’s nice to have space to write your songs and parts.”

Paul Savage, who oversaw the incoherent mumbles and distant murmurs that characterised turbulent 1997 début Mogwai Young Team, returned to produce album number seven.

He has harnessed the intensity of that first record and captured the ardour of a Mogwai gig.

He has realised the reason Mogwai are still around making music when most of the post-rock groups that sprung from the mid-1990s scene have disappeared is because they are at their most creative when at their most earnest. He knows the key to being relevant is to keep changing.

“We have always, sometimes with and sometimes without success, tried to vary what we do,” says Burns. “We are easily bored and musically fidgety.”

Having a huge record collection and an eclectic taste is beneficial.

“It’s been a help to be inspired by all the different genres of music that have transpired while we have been together. You could read that as we stole ideas from everything in between IDM and Witch House.”

Stuart Braithwaite, guitars, vocals, Mogwai co-founder with Dominic Aitchison, cites slo-core, Slint, Codeine and Low as being essential factors in the sound.

“Slint was absolutely inspirational,”

Braithwaite says. “My earliest musical enlightenment came from Velvet Underground, Jimi Hendrix, Sonic Youth, The Cure and My Bloody Valentine. I always had a big interest in rock music.”

By tinkering only slightly with the instrumentation, Mogwai have gently evolved, says Braithwaite.

“I think musically we just try different things. It’s nothing really drastic, just organic changes. We have tried a lot of different instrumentation over time.

“The Hawk Is Howling [from 2008] was a more sparse, heavy record, whereas Hardcore is probably more upbeat and optimistic.”

Support from Glaswegian posthardcore electronic outfit, Errors.

*Starts 8pm, tickets £20. Call 01424 229111.