Whatever, Army Of Freshman are a force to be reckoned with – six very proud, very loud Americans who like to party like it's, well, 2008.

Until this year, the California sextet were largely unheard of this side of the Atlantic. Famous for supporting other bands rather than headlining their own shows, their first headline tour kicked off last June, and they are the first non-metal band (AOF are a pop-punk band) to appear at the Download metal festival, winning favourable reviews – as well as new fans – along the way.

They're also one of the hardest working bands in the business. Spending most of their time inside a van when not performing on stage, the band have played more than 1000 shows in 43 American States and ten countries over ten years. They're also one of few bands to have one million hits on their MySpace without having hit the mainstream charts.

So all begs the question: are they any good? Perhaps the lengthy queue snaking its way along Calton Road will give you some indication of the band's popularity when they roll into the Capital to play Studio 24 tomorrow night.

For this month sees the band embark on their No One's Famous tour in support of their new and much anticipated fourth album, Above The Atmosphere.

A storming tour of the pop-punk genre, featuring power-pop keyboards and (would you believe it for a punk band) vocal harmonies, it all makes for a fun, sing-along show.

Led by founders Chris Jurewicz (vocals), Aaron Goldberg (guitar) and Owen Bucey (keyboards), as Jurewicz enthuses, the band are enjoying being back in the UK and playing Scotland so quickly.

"We love it over here, everyone's really nice and receptive to what we do. I like it here more personally, just the energy. UK kids know how to go to a show, they just come to have a good time and they're in the zone."

Bucey concurs, "The kids are definitely a lot cooler, there's a lot of jaded fools in the States."

Well known to their loyal legion of fans, the band regularly keep in touch with their fanbase via email and instant messaging. During their Hard Road To Dallas Tour, the band asked fans to bring along something for the group. They kindly obliged, sending the band lots of water to keep them cool amidst the energy-sapping American heat.

"In America where the tours are so long, the drives are so long and the weathers so hot, that extra case of water really does make a difference," says Jurewicz. "We've had some cool presents though – a girl drew a painting of my head from a photo at a show and that's a really cool gift, something to keep, and we've been really lucky that way."

And what do the band think about their fans who sport Army Of Freshman tattoos?

"Definite compliment," says Goldberg. "I think there's ten or twelve Army Of Freshmen tattoos now. We try to stay up on it and take pictures of them and put them on our website. It's awesome."

Are you ready to join the Army? If so, check them out – at the double.

Support on the night comes from local melodic rock outfit, The Mars Patrol.

• Army Of Freshman, Studio 24, Calton Road, tomorrow, £7.50, 7pm 0131–558 3758