Lateralus (pronounced /lætərˈælɪs/) is the third studio album by American alternative/progressive metal band Tool. The album was released on May 15, 2001, and debuted at number one on the Billboard 200 chart. On August 5, 2003, Lateralus was certified double platinum by the RIAA. On August 30, 2004 the album was certified Silver by the BPI for sales of 60,000 in the UK. On August 23, 2005, Lateralus was released as a limited edition two-picture-disc vinyl LP in a holographic gatefold package. As with Ænima and Undertow, the album is replete with time signature changes, more than ever. Overall, Lateralus Read more on Last.fm.