attain bass sounds on guitars. The I EP contains a single, 21-minute song of complex arrangements and was a hint of the forthcoming album, 2005's Catch Thirtythree. The EP, which has never been played live by the band, was written and recorded during jamming sessions of Haake and Thordendal. On Catch Thirtythree, Meshuggah again used eight-string guitars, but utilized programmed drums for the first time also for the release, with the exception of two songs from 2001's compilation Rare Trax. The album was self-produced by the band and was recorded at the studio that Meshuggah shares with Clawfinger. Hagström notes, "The eight-strings really have given us a whole new musical vocabulary to work with. Part of it is the restrictions they impose: you really can't play power chords with them; the sound just turns to mush. Instead, we concentrated on coming up with really unusual single-note parts, new tunings and chord voicings. We wanted to get as far away from any kind of conventions and traditions as we could on the album, so the guitars worked out beautifully." Catch Thirtythree is one 47-minute song divided into 13 sections. It is more mid-tempo guitar riff based, and a more straightforward and experimental full-length album than Chaosphere or Nothing. Nick Terry of Decibel Magazine describes the album as a four-movement symphony. Some songs still use Meshuggah's "familiar template combining harsh vocals and nightmarish melodies over coarse, mechanically advancing, oddball tempos", while others explore ambient sounds and quieter dynamics. The first part of Catch Thirtythree centers around two simple riffs. In the song "In Death - Is Death", the band uses a combination of noise and silence, which is in contrast with the atypical melodies on "Dehumanization". On "Mind's Mirrors", Meshuggah used electronics, programming and "robotic voices". "Shed" incorporates tribal percussion and whispered vocals. obZen and Koloss With 2008's obZen, Meshuggah moved away from the experimentation of 2002's Nothing and 2005's Catch Thirtythree to return to the musical style of its previous albums, such as Contradictions Collapse, Destroy Erase Improve and Chaosphere, while still maintaining its focus on musical and technical innovation. The album loses some of the quick, mathematical rhythmic changes of past releases and the melodic orchestration of Catch Thirty-Three and uses "angular" riffs, mid-tempo and common 4/4 beats. The album is a culmination of the band's previous work. Meshuggah decided to self-produce because it sought to retain artistic control over