"Amnesiac" is the fifth studio album by the English rock band Radiohead, released in 2001. The album features a blend of alternative rock and electronic music, showcasing the band's experimental sound. It includes notable tracks like "Pyramid Song" and "Knives Out," which explore themes of memory, loss, and existentialism. The album was recorded during the same sessions as their previous work, "Kid A," and reflects a more introspective and atmospheric style. Critics praised "Amnesiac" for its innovative approach and emotional depth, solidifying Radiohead's reputation as one of the most influential bands of their time.