The soundtrack mostly consists of previously unreleased songs and studio outtakes culled from Fugazi's history to that point, as well as seven demo versions of songs from their proper albums (six from 1998's End Hits and one from 1993's In on the Kill Taker).
Brent DiCrescenzo of Pitchfork gave the album a positive review, describing it as "sound[ing] remarkably playful" and concluding: "For all those who worry that the Fugazi story may be coming to an end, both Instrument and its soundtrack show a band still growing and, in some ways, just getting started."[14] Amy Sciarretto of CMJ New Music Report wrote: "Collecting 18 surprisingly ambient, previously unreleased Fugazi demos and practice tapes, [...] Instrument is Fugazi's most focused attempt at mellowness and subtlety."[16]The New Rolling Stone Album Guide called the album "mostly ragged and unformed, but for confirmed Fugaziphiles, it's a solidly interesting peek into the band's creative process."[13]
MacKaye later said of the album:
Instrument is sort of my favorite record, because those were recorded for us. So none of it was for public consumption. So when you listen back, it's just us practicing, us playing together, and it just sounds relaxed.[17]
^Daly, Rhian (March 6, 2020). "Warpaint's jennylee shares bewitching cover of Fugazi classic 'I'm So Tired'". NME. Retrieved April 22, 2020. I love, admire and respect Fugazi with my whole heart… always have. The sentiment of 'I'm So Tired' is deeply moving and extremely relatable. It was such a pleasure and a pleasant surprise I was able to pull this off. I hope I did it justice, it sure was FUN (and that's the point of it all). Big love and kudos to Fugazi forever.