Diabolus in Musica is the eighth studio album by Slayer. Released on June 9, 1998, it is the second studio album to feature drummer Paul Bostaph. Although receiving mixed critical reviews, the album sold 46,000 copies in its first week to peak at number 31 on the Billboard 200. Guitarist Jeff Hanneman wrote most of the album’s content which has been described as Slayer’s most experimental album. It is the band’s first studio album to be played mostly in C♯ tuning. The album’s title is a Latin term for “The Devil in Music”, a musical interval known for its dissonance. Lyrical themes explored on the album include religion, cultural deviance, death, insanity, war, and homicide.