Say what you will about the indier-than-thou snobbery that often lurks beneath the surface of influential music Web sites like Pitchfork, Stereogum, BrooklynVegan, and Gorilla vs. Bear; their support can make or break a young artist these days. Thanks to numerous blog nods, for example, Long Island–based band Twin Sister has built a considerable underground buzz without relying on a massive marketing budget or endless cross-country touring. In fact, the five-piece already has an international following, which came as a shock to guitarist Eric Cardona, singer Andrea Estella, drummer Bryan Ujueta, bassist Gabel D’Amico, and keyboardist Udbhav Gupta.

“That was the most bizarre part, the first time someone out of the country contacted us,” says Cardona, reached at the rented house in Dix Hills that the band uses for rehearsals and recording. “Somebody contacted us from Germany, I think it was, and we were freaking out. We were so excited to hear that.”

In terms of attracting attention on that newfangled series of tubes known as the Internet, it probably doesn’t hurt that Twin Sister offers all of its songs for free on its Web site. Those who prefer their music on something they can hold can also buy the group’s two EPs—2008’s Vampires With Dreaming Kids and this year’s Color Your Life—on CD or vinyl, and there’s also a cassette of demos, called Alternates, floating around.

Given how prolific the band is, how does it decide which songs will find a finished form and which are destined to remain demos? “It’s hard to say, because a lot of them don’t have lyrics and words,” Cardona says. “So the minute that Andrea will have one at her house and just be able to listen to it on her own, that really pushes it up to the front lines. For instance, the ”˜Lady Daydream’ cassette version: there’s a version on our Web site called ”˜Smoke’, and it’s just an instrumental of the cassette version, without the vocals. We gave that to Andrea and she immediately wrote the words and the vocals, and within the week we started forming the song as a band.”

As it appears on Color Your Life, “Lady Daydream” is a pastel-tinted swirl of reverb-drowned guitar topped by Estella’s I-have-a-secret vocals. Since cassettes are, perversely, all the rage with indie kids right now, it bears mentioning that “Lady Daydream” would be a perfect fit on a mix tape that also includes selections by Beach House and A Sunny Day in Glasgow.

Those reference points might shift somewhat in the near future, though. Cardona reveals that Twin Sister’s most recent batch of demos has been heavily influenced by electronic music and club culture.

“The motor is always going,” the guitarist says. “We’re always very anxious to give more of ourselves into our recordings, because we feel like, as far as the arrangements and the songwriting, the two EPs are specific sections of our spectrum. And I think we have a lot to offer from ourselves as musicians to expand and to explore new sounds.”

Twin Sister plays the Biltmore Cabaret on Saturday (July 24).