Concrete is a demo album of the early Fear Factory, recorded in 1991 as pre-Soul of a New Machine cuts and re-released on July 30, 2002 on CD.
Although released in 2002, Concrete was originally recorded in 1991 in Blackie Lawless' studios. It was intended to be their first release, but the band wasn't happy with the record deal they were in, so they ditched their producer, Ross Robinson.
When they were taken to court, Robinson won the rights to the album, and the band won the rights to songs. So Fear Factory ended up re-recording eight of the tracks from this album for their official 1992 debut, Soul of a New Machine.
Incidentally, Robinson ended up using this album to promote himself, which would eventually lead him to producing Korn, which would make him the most sought-out nu metal producer of the 1990s. The band's record label (Roadrunner) released this album after their (now temporary) breakup to fulfill their contractual duties.
Track 3, "Concrete" was later renamed as "Concreto" and rerecorded as a b-side for the "Dog Day Sunrise" single and later appeared as a bonus track for the Obsolete digipak.
Track 15, "Piss Christ" is not to be confused with the song of the same name