Broods perform at sold-out Powerstation

Half top-knots, selfies and a cloaked man palming off tickets to impressionable teens: This is the line to the debut headline concert of New Zealand's newest indie music darlings.

It's a line that stretches 100 metres from the doors of Auckland's sold-out Powerstation.

The big deal? Broods, an energetic brother-sister duo hailing from Nelson, based in Auckland and consisting of Caleb and Georgia Nott.

On par with most local musicians who receive any inch of international attention, Broods have already had the inevitable Lorde comparisons.

Still, such remarks are warranted.

The two acts share the same co-writer and producer Joel Little (who seems to have achieved the perfect indie-pop formula for success), released music for free online  (Bridges garnered nearly half a million hits in three months on Sound Cloud) and have a strong youth following.

But where Lorde is measured and has a hip-hop undertone, Georgia and Caleb bounce with energy and punchy chords that have a couple of punters murmuring "Flumes" and others reminiscent of The Naked and Famous' early days.

They embrace a no-holding-back attitude, when Georgia's angry, she stomps, when she's happy, she jumps and orchestrates the crowd with her hands.

The overall mood is brooding (if you will) but it works well for an act who are early in their twenties and, judging by the audience, it hits a note.

The top balcony is dedicated to the under-18s of the crowd and what they lack in legal drinking status, they make up for in adoration, with diehard fans exclaiming love for Georgia from up above.

Sleep Baby Sleep is a down-tempo lullaby, with Georgia's wispy vocals mesmerising the crowd - despite her admission prior that she was suffering a cold.

"As you can tell by the cups of tea scattered around the stage, my voice is having a bit of a s***," she says.

"Say 's***' again," yells an enthused under-18-year-old.

The one hour performance perfectly encapsulates what it means to be young, unsure and wistful but the pair don't sacrifice maturity to portray this.

In Four Walls, a ballad where Georgia's vocals are crystal clear, she sings of finding the perfect man.

"Those four walls now are the only place that I can feel. Those four walls now are home."

The final encore is international hit Mother and Father, in which the pair muse on getting older, moving out of the family home and pack a punch both emotionally and in the uplifting chorus.

The understated, electronic-based, female-fronted pop act has increased in popularity since the rise of The XX and with a hint of Ellie Goulding (Broods opened for her earlier this year), and Chvrches, it's worth getting in on the action before they're snapped up overseas.