Billie Eilish Says an Older Version of 'Birds of a Feather' Was Worked on in the Back of an SUV in Brazil

"Birds of a Feather" was featured on Eilish's May studio album 'Hit Me Hard and Soft'

For Billie Eilish and her brother Finneas, creativity blossoms in unlikely places.

During a Wednesday, Sept. 4 appearance on Jimmy Kimmel Live!, the Grammy-winner shared a never-before-seen clip of herself and Finneas working in the back of an SUV.

"This is a video I took on my phone in the back of the SUV in Brazil on the way to doing a show a year and a half ago," Eilish, 22, told the host. "This is a very normal thing for me and Finneas. We're always finding ourselves working in the most random places."

She added, "It's fun because it's so casual and normal and we were just in the back of this car and it's Finneas' laptop."

In the video, Eilish and Finneas, 27, are working on an older version of "Birds of a Feather," which was featured on her latest studio album Hit Me Hard and Soft. Eilish can be heard singing along and offering Finneas tips before his laptop dies and he disappointedly shuts it.

Related: Billie Eilish and Finneas Got into a 'Big Fight' While Working on New Album Hit Me Hard and Soft

"That song never felt right... there's so many different versions," the "Ocean Eyes" singer said. "It's such an old version of the song that I don't even really remember and it sounds so different and it's just really amazing to see how far the song has come."

When Kimmel, 56, asked if she ever likes an older version of a song more than the one she released, Eilish said "it's almost always horribly terrible."

Eilish — who was recently named Spotify's most-streamed monthly artist — and Finneas have opened up about the making of Hit Me Hard and Soft in the past. During an interview with Apple Music's Zane Lowe in May, the duo opened up about a "big fight" they had over "context and subject matter" of the LP.

"We'd been writing these fragments of stuff and I felt... I've been proven wrong over and over, but this was the jag I was on that night. I was like, 'Subject-wise, I'm not being led into what you're actually feeling. And I think that there are real guards up,'" Finneas said.

He added of the songwriting process, "Oftentimes in your life, you're going through the thing that you're going to write about later. And that was for sure happening to Billie at that point in time where I'd be like, 'What's this about?' And she'd be like, 'Nothing.'"

Eilish chimed in and noted that her brother’s reaction at the time scared her, particularly when he said, "I don't like doing this anymore. I don't want to write music right now."

Related: Billie Eilish Reacts to Becoming Spotify's Most-Streamed Monthly Artist: 'I Really Can't Even Believe This'

"I used to be like, '[I] hate making music, [I] don't want to make it, [I] don't like making it,'" the singer said. "It's frustrating. It's irritating. I love having made it. I love performing it. I love when it's good, but I really have always struggled with the process."

Then, she realized she was “finally enjoying the process” when Finneas was suddenly uninterested.

"It was very interesting because I saw myself in that. I was like, ‘I have felt that way and you have always been the thing that keeps the ship moving, and now you feel that way. What does that mean for us? And what are we going to do?’"

Eilish released Hit Me Hard and Soft on May 17.

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