Instrumentals is a 37-minute album composed of two extended instrumental pieces: "Music for Indigo" and "Mostly Chimes". "Music for Indigo" features a collage of acoustic guitar improvisation. Towards the end of the piece, Lenker can be heard sighing and saying "I'm starting over". "Music for Indigo" was written by Lenker for her former partner to listen to while falling asleep at night. "Mostly Chimes" begins with four minutes of same guitar improvisation, but shifts to earth sounds. The remainder of the piece features recordings of primarily wind, chimes and birdsong.
