De-Loused in the Comatorium is the debut studio album by American progressive rock band The Mars Volta, originally released on June 24, 2003, on Gold Standard Laboratories and Universal Records. Based on a short story written by lead singer Cedric Bixler-Zavala and sound manipulation artist Jeremy Michael Ward, the concept album is an hour-long tale of Cerpin Taxt, a man who enters a week-long coma after overdosing on a mixture of morphine and rat poison. The story of Cerpin Taxt alludes to the death of El Paso, Texas artist — and Bixler-Zavala’s friend — Julio Venegas (1972–1996).
Co-produced by Rick Rubin and guitarist Omar Rodriguez-Lopez, it is the only studio album to feature founding member Jeremy Michael Ward, who was found dead in an apparent heroin overdose one month before the album was released. Following the departure of Eva Gardner, Red Hot Chili Peppers bassist Flea occupied the role of bass guitarist on this album.
The music contained in De-Loused is distinguished by its enigmatic lyrics, Latin and jazz rhythms, and Omar Rodríguez-López’s frenetic guitar riffs, which are often strongly dissonant. The title of this album is taken from the lyrics of the song “Eunuch Provocateur” on the band’s previous release, Tremulant. The cover artwork is by Storm Thorgerson.