Brian Witzig has put out three albums of what could be described as instrumental hip-hop under the name The Sound Defects. While his previous two records, labeled Volume I and Volume II, featured a few of his friends on various instruments, Witzig created his latest, Iron Horse, exclusively with samples.

This Sound Defects album is the soundtrack for a film that is yet to exist. In fact, Witzig was originally hoping to work with a friend to create a short animated video to coincide with his album's release, something with a biker vs. Rambo theme. Although the short film never came to fruition, the album features album art and track names ("Johnny Law," "Jean Jacket John") that depict the leather-clad world of motorcycle maintenance.

Highlights of the album include "Angels," which saucily samples Billie Holiday vocals and the eerie "War." "Ain't Right" and "Jean Jacket John" blend funk horns and James Brown's trademark grunts and growls with contemporary electronic beats.