Fecal Matter was a short-lived Punk Rock band started in 1985. The group was formed by Kurt Cobain, Dale Crover, and Greg Hokason.

Some songs that were originally recorded by Fecal Matter that were later rerecorded or either used by Cobain’s later group Nirvana are Spank Thru, Downer, and Anorexorcist.

The 1986 Fecal Matter Demo was Recorded on Kurt’s Aunt’s TEAC A-2340 Reel-to-Reel Recorder, with a 7-Channel Peavy Mixer, which she later sold to him.

Kurt & Courtney - Wikipedia

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Wikipedia

Kurt & Courtney Directed by Nick Broomfield Written by Nick Broomfield Produced by Nick Broomfield Narrated by Nick Broomfield Cinematography Joan ChurchillAlex Vender Edited by Mark AtkinsHarley Escudier Music by David Bergeaud Dylan Carlson Distributed by Capitol Films 27 February 1998 (United States) 3 July 1998 (United Kingdom) 95 minutes Country United Kingdom Language English Kurt & Courtney is a 1998 British documentary film by Nick Broomfield investigating the circumstances surrounding the death of Kurt Cobain, and allegations of Courtney Love's involvement in it.

The band broke up in 1986, but Cobain still went around giving out Fecal Matter demos to friends like Krist Novoselic. Novoselic and Cobain re-recorded Fecal Matter songs and used Downer in Nirvanas first album Bleach and played Spank Thru live on multiple occasions.