A pushing, moving mass of head-bopping fans develops at the front of the stage at Minus Scale shows, singing every word. Bassist Derek Archambault and frontman Ryan Levassuer are screaming into the same microphone, while guitarist AJ Tobey hunches over his guitar, his back to the audience. Drummer Pat Griffin’s sticks come from fully extended arms above the drums for every hit, and keyboardist Padraig Murphy’s forehead is only an inch or two above the keyboard he’s abusing.

Exeter’s The Minus Scale might be your favorite band. Or perhaps they are the guilty pleasure you don’t talk about with your indie rock snob friends. If you’re one of those few left on the Seacoast who hasn’t heard of them before, that’s sure to be remedied soon.

Each song in the band’s catalog of three-minute bliss sessions, with a sound reminiscent of “The Get Up Kids” and “The Anniversary,” is crafted to outdo itself.

Recently the band recorded a new four-song EP titled “For Lack of Lights,” and with new members Archambault (of Alcoa fame) and Griffin, they are out to let people know about it.

“We promote the band by giving away the music,” says 24-year-old guitarist/singer Ryan Levasseur, who grew up in Somersworth. “They’ll hopefully come to a show, buy a T-shirt, and tell their friends to come to the next show.”

The band opted to post the songs from their new EP up on their purevolume.com site for their fans to download for free, rather than print a run of CDs. PureVolume, much like MySpace, is one of the free music sites of choice for up-and-coming indie bands.

“We’re good at selling T-shirts,” says Tobey, 25. “They’re cheap to make, we get our money back, and we make money from venues when we play. Pressing a record could only hurt us.”

Then PureVolume chose The Minus Scale a few weeks ago to be a “Pure Pick,” one of several bands featured on the PureVolume homepage. Bands are chosen as Pure Picks by Web site staff for how much buzz surrounds them, meaning that they favor bands with new releases, frequently updated profiles, press releases, and large numbers of profile views. So there they were, on the site’s tidy front page, and the subsequent shenanigans were slightly unexpected and only a  tad short of miraculous.

As an unsigned band, their profile “views” and “plays” went from a couple hundred per week to 6,000-8,000 plays and 1,000-2,000 downloads per day, making them the site’s number-one downloaded band among unsigned bands for that week. Also, with 1,500 profile views per day, there was at least one download per person who looked at their site. People weren’t just listening; they were taking something with them.

The band members look like they sound. Levasseur is the sort of frontman you’d expect, with intentionally messy and slightly overgrown hair framing the perfect skin of a handsome face, from which emerges bell-tone clear vocals. Tobey seems completely preoccupied with his own overgrown locks as he continually sweeps the hair away from his face, the length of which makes his highly enthusiastic stage presence that much more effective as it whips to and fro with his playing. Both Griffin, 23, and Archambault, 24, defy gravity with their slender physique. It would take a team of scientists at MIT to discover how they keep their pants up with the absence of hips. Murphy? He’s a 22-year-old Irishman. ’Nuff said.

“I think the band now is really an amalgamation of all of our personal styles and tastes,” says Murphy. “If you listen to the Minus Scale a year ago it’s a completely different animal now, and in my humblest of opinions, a better band. As far as my personal contributions go, I’m not really a keyboardist and I approach my role and instrument as a guitar player.”

Crazy hair and lack of hips notwithstanding, the free downloading and word-of-mouth method of promotion has worked out well for the boys. Because of both their high energy hook-laden pop sound and their Internet-based methods of marketing, the band has become popular among a younger crowd of listeners. That, too, is by design. According to Levasseur, the band ultimately doesn’t seek to write anything more complicated than the minimum of what it takes to make someone dance.

“I feel as though I’ve never grown up, and I identify with the kids who go to our shows,” he says. “If our sound attracts younger listeners, then that’s the way it is. I’m fine with that.”

Even in a blizzard a few weeks ago, 86 enthusiastic listeners paid the cover at Sad Café in Plaistow. A couple of them came all the way from Bangor and Portland to see bassist Mark Tobey’s last show with the band (he’s leaving to pursue his work as a teacher). They’ve recently played sold-out all-ages gigs at The Dover Brick House as well, with those T-shirts flying off their merchandise table at the back of the room. And word is spreading. Pockets of fans in places like Michigan and Wisconsin have developed, and when the band is on tour, they’re more likely to sell out in a New Jersey town than they are in downtown Portsmouth, where most of them live. Their ultimate goal is to be signed by a label that will eventually fund recordings. Getting that kind of attention might be only a stone’s throw away for these New Hampshire born-and-raised guys, if their recent success on PureVolume is any indication of what they’re capable of.

“Would I like to get signed and not have to work anymore? Of course,” says Murphy. “We’re just five guys that love what we do and hope that other people will love it too. The thing with us is that if we get signed or we just fall into obscurity, we still do this for us and for our own enjoyment. Everything else is a bonus.”