Meshuggah returned to the studio in March 2007 to record "obZen", with recording concluding in October 2007, and the album being released in March 2008. The band spent almost a year on the album, its longest recording session yet. A significant portion of the year was spent learning to perform the songs they wrote; the recording itself took six months. "obZen" reached No. 59 on the "Billboard" 200 chart, selling 11,400 U.S. copies in its first week of release and 50,000 copies after six months. With "obZen", Meshuggah received more media attention and attracted new fans. The release was followed by a world tour, which started in the U.S. and proceeded to Europe, Asia and Australia.