It's Lorde's first new material since the Disclosure collaboration Magnets in 2015 and precedes her second album, which is due later this year.
In an interview with Internet radio's Beats 1, she tells Zane Lowe that the track was inspired by her first "heartbreak", and the chorus features the telling line: "I'll come get my things/But I can't let go".
Lorde, announcing the release on Twitter, called the song "very different, and kinda unexpected".
It started with a tweet, then a couple dozen more, a treasure hunt, and now Lorde's new single Green Light has finally dropped. "Green Light" may be more "pop" than "alt", but we're confident this so-called "new chapter" will bring plenty of promise. It's a ideal music video centered on Lorde herself considering fans haven't seen much from her in the past couple of years. The "Green Light" video was directed by Grant Singer, who recently directed the video for Lorde pal Taylor Swift's "I Don't Wanna Live Forever".
Lorde said the past year of transitioning into adulthood had inspired the forthcoming record, which is planned for a summer release. "I realized this is that drunk girl at the party dancing around, crying about her ex-boyfriend who everyone thinks is a mess. I think it can kind of fuck with you if you're a kid".
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Check out the Green Light video below.
It seems Lorde has had no shortage of inspiration since the release of her critically acclaimed debut album, Pure Heroine, in 2013. We can't wait to hear the rest of the album.
She said of making Melodrama: "I needed to just go away, go home to New Zealand, and hang out by myself and figure out what I was going to do next".
One of the windows had the words "I do my makeup in someone else's car" displayed, leading many to guess they were part of the lyrics to one of Lorde's new songs.