"Black Coffee" opens with a stark introduction sung by Lewis, accompanied only by glitching electronics with no chord progression, before going into the pre-chorus where a more mellow sequence featuring breathy keyboards begin playing. In the chorus, the song becomes wistful featuring Natalie on lead vocals singing a call and response with Blatt. A subsequent verse sung by Lewis returns to the eerie and sinister sound of her introduction. After the second chorus, the song enters into a bridge where the group hum and Lewis sings two lines from the pre-chorus, "Each moment is cool / Freeze the moment". The track later ends in an outro sung by Lewis using the same lyrics and starker sound from her introduction, but enhanced by guitar, synths and welding, clipped dance rhythms.