Having a length of three minutes and fifty-one seconds (3:51),[REF] "Flatline" is styled in the genres of pop and R&B, and was produced by Dev Hynes [REF].
It commences with a "noodly" guitar riff,[REF] set against a 90s-inspired piano-driven R&B melodies and "bubbling"[REF] 80s pop beats, which is reminiscent of the production found in American recording artist Solange Knowles' extended play True-which, much like "Flatline", was produced entirely by Hynes.