Downside Up is a four-disc box set collecting B-sides and bonus material from the catalogue of Siouxsie and the Banshees. Also included (on disc four) is The Thorn EP, originally released in 1984. Most of these songs (only present on these CDs) were classics of the band's live repertoire like "Pulled To Bits", "Eve White/Eve Black", "Red Over White", "I Promise", "Something Blue", "El Dia De Los Muertos" and "B-side Ourselves".
