Billie Eilish says her single 'Everything I Wanted' is about her relationship with her brother.
The 17-year-old singer - who collaborates on her music with her elder sibling Finneas - has opened up on the process of writing her latest hit, and she explained how one line "paved the way" for the track as a whole.
Appearing in a behind the scenes 'making of' video for Beats by Dr. Dre - which marked the launch of Billie's own Beasts Solo Pro headphones - she said: "Finneas came up with, 'As long as I'm here, no one can hurt you'.
"We decided to make it about our relationship and how we help each other and like deal with things together.
"It just completely like paved the way for the rest of the song."
Finneas, 22, admitted the duo make sure both of them can relate to the lyrics they're working on, because it makes the create process easier.
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He explained: "When Billie and I write songs together, we're having to write lyrics that we both identify with so we can continue the narrative."
Billie recently revealed she's so pleased with how the record turned out because the song has "so many meanings", with every lyric having a "specific instance" that it was written about.
And the 'Bad Guy' has plans to write down what every lyric in the new song means to her, although she may not let anyone see it.
She previously said: "It feels very satisfying. Very satisfying. And also the song has so many meanings. Every lyric in that song has a very specific meaning and specific instance that it was written about.
"I just want to just sit down and write what every single line means just for myself, even if it's never shared with anybody."