Featuring a dreamy, fractured vocal over a deep electric beat, it was an impressive introduction - and one that extolled the virtues of a stimulant-free life ("drink is a soft kind prison," she trilled).
The song was a comment "on society's inability to function without mind-altering substances," she explained to BlahBlahBlahScience. "I think there's something really lovely in being able to be a human and be nervous and weird and be okay with it. Everyone wants to be sold a lifestyle but no one wants to honestly feel what it is to be consciously alive."
In another interview, with Pigeons and Planes, the singer said it was one of the first songs she had written, after being encouraged by a photographer who discovered Kacy singing to herself on a shoot.
As someone whose first song was about a two-headed robot, colour me impressed.
Kacy grew up in Phoenix, Arizona, and began modelling as a teenager. She moved to LA aged 16 after graduating from High School and was cast in a string of commercials for American Apparel. Perhaps more importantly for her future career, she landed the job of backing dancer on Kanye's Yeezus tour last year.
But the 21-year-old has been silent since signing her deal last December... until now.
Foreign Fields - a gorgeous, swelling electronic epic - is her G.O.O.D. Music debut; calling to mind the minimalism of James Blake and the melodies of Little Dragon's Yukimi Nagano. Others have compared Kacy to Jamie Woon and FKA Twigs - so you get the picture.
Lyrically, the song is about "finding people in your life that help you progress and move you forward," Kacy told Hunger TV. It exemplifies the "sweet spot between classic pop and 'cool' music," that she's trying to capture on her forthcoming debut album.
Watch the unsettling, Rankin-directed video below.
Fun fact: Kacy can lick her elbow.