Picture: Courtesy of First Aid Kit

In 2008, Robin Pecknold of Fleet Foxes shared a video of two young Swedish sisters performing his band's Tiger Mountain Peasant Song on YouTube. Six years, three albums and over 3.9 million views of that same clip later, Klara and Johanna Söderberg, better known as First Aid Kit, are a Scandinavian sensation, with four Swedish Grammis awards and two number one albums under their belts, not to mention an army of 57,000 Twitter followers (and counting).

Earlier this month, they released the fourth addition to their musical roster – a flawless 10-track album entitled Stay Gold. Inspired by the Robert Frost poem, Nothing Gold Can Stay, the Death Valley desert and "the pains of being away from loved ones while on tour, fear of the future and longing for the past, among many other things," according to the duo, Stay Gold is First Aid Kit's most accomplished release to date. It boasts the same haunting lyrics, untouchable harmonies, nimble finger-picking and country twang that we adored on their last album The Lion's Roar, but with a richer, more evolved sound.

With lyrics that tell of leaving home, discovering new places, losing friends and chasing destinies, these songs are honest, relatable and, when assembled with faultless instrumentals and a pair of voices that couldn't possibly be more in tune with each other, have the power to convert newcomers into fans instantly.

Way Out West Festival, August 2012. Picture: Getty Images

On stage, Klara and Johanna are a vision in vintage. "We love flowy dresses, angel sleeves, floral prints, paisley patterns, fringes and golden metallic. We're also crazy about hats and sunglasses. Anything that screams bohemian and takes us back to Laurel Canyon in the Sixties wins big time," says Johanna. But, don't let the flowery dresses and floppy hats fool you. These ethereal sisters sure know how to headbang, and they have an electricity that hypnotises every audience. "We love intimate theatre shows, where you can see everyone in the crowd and really feel the atmosphere of the room, but we also love to play festivals because they're more of a challenge," Klara tells us. "Some people in the crowd have no clue who we are so we have to encourage them to stay and listen. When we do, it's an amazing feeling because we know we've gained new fans."

Off stage, the Söderberg sisters are at one with nature, filling their precious free time with long walks in the woods, cheese and wine picnics in the park and, when the weather allows, outdoor swimming. But, like all true musicians, their profession is also their passion. So, if they're not belting out old-school pop ballads ("We love karaoke! We always sing Chiquitita by ABBA and When You Believe by Mariah Carey and Whitney Houston, and we also do a great rendition of the Spice Girls' Wannabe," laughs Johanna), they're songwriting. "We wish we could just go into an office and write, but inspiration can strike anytime, it's super unpredictable," adds Klara. "Seeing a sad-looking waitress at an American diner, the colour of the redwood trees of California, passing through the gloomy mist of the Scottish moors – we try to open our eyes and really take things in."

Islington Assembly Hall, May 2014. Picture: Getty Images

This September, First Aid Kit touches down in London for their first-ever gig at the Royal Albert Hall, but they are no strangers to the Big Smoke. "When we're in London we always go to a restaurant called Harana in Shepherd's Bush for simple delicious Turkish meze, and we love shopping in Paper Dress Vintage," says Klara. "If it's a warm summer day, we like to go to South Bank and just hang out by the water and the London Eye – it's such a sweet spot."

Along with performing and meeting their adoring fans, it's having this chance to explore and travel all over the world that makes the Söderberg sisters so thankful for what they do. "You learn so much about yourself while travelling," explains Johanna. "Discovering new places, seeing new faces, waking up each day in a new city – it's exciting and refreshing. You get a chance to start over everyday."

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To celebrate the release of Stay Gold, Klara and Johanna have created an exclusive playlist for Bazaar readers, sharing their "all-time favourite songs. These songs really define our world of folk. They're our main inspirations and the tunes that we keep going back to. From Emmylou Harris to Neko Case to Patti Smith to Leonard Cohen, we think this is classic and timeless music." Plus, we've added a few of our First Aid Kit favourites - listen below.

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Follow First Aid Kit on Twitter @FirstAidKitBand, Instagram @FirstAidKit and visit thisisfirstaidkit.com for more

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