Of Natural History is the second studio album by avant-rock/metal group Sleepytime Gorilla Museum. It was recorded and mixed at Polymorph Recording in Oakland, California during the years 2003 and 2004. Whereas on the first album, Grand Opening and Closing, Dan Rathbun handled the mastering, on Of Natural History the mastering duties are handled by Justin Weis, who mastered the album at Trakworx, San Francisco. All the tracks on this album were produced by Rathbun & the other members of the band, except for "Phthisis", which was produced by Scott Humphrey, and recorded at the Chop Shop, Hollywood in May 2004; Chris Baseford engineered the recording sessions, while Garry Raposo and Vincent Piette assisted in engineering. Like with the first album, this album again marks the transition from one drummer to another: Frank Grau, who replaced David Shamrock after Grand Opening and Closing, left after this album, and was replaced by Matthias Bossi, who plays different instruments on this album's tracks "Phthisis", "FC: The Freedom Club" and "Gunday's Child". In 2024, it was named one of the 10 "wackiest" progressive metal albums ever by Loudwire. From Wikipedia (https://en.wikipedia.org/wiki/Of_Natu...) under Creative Commons Attribution CC-BY-SA 3.0 (https://creativecommons.org/licenses/...)