Demon Days is the second studio album by English virtual band Gorillaz. Produced by the band, Danger Mouse, Jason Cox, and James Dring, the album features contributions from De La Soul, Neneh Cherry, Martina Topley-Bird, Roots Manuva, MF Doom, Ike Turner, Bootie Brown of the Pharcyde, Shaun Ryder, and Dennis Hopper. A darker, less cartoonish world where hip-hop, brit-rock, electronica and Dennis Hopper monologues all seem perfectly at home. Demon Days goes boldly against the current trend for brash immediacy and instead repays time and effort on the part of the listener. Songs that at first sound half-finished, reveal themselves with each listen.

Gorillaz are a British virtual band created in 1998 by musician Damon Albarn and artist Jamie Hewlett. The band primarily consists of four animated members: 2-D (lead vocals, keyboards, melodica), Murdoc Niccals (bass guitar), Noodle (guitars, occasionally keyboards and vocals), and Russel Hobbs (drums and percussion). Their fictional universe is explored through music videos, interviews, and other short cartoons. In reality, Albarn is the only permanent musical contributor, and often collaborates with other musicians.