The record has the singing of Horace Andy plus invited vocalists: Tunde Adebimpe of TV On The Radio, Damon Albarn of Blur and Gorillaz, Hope Sandoval of Hope Sandoval And The Warm Inventions and Mazzy Star, Guy Garvey of Elbow and Martina Topley-Bird, as well as guitar playing by Adrian Utley of Portishead (on "Saturday Come Slow"), keys from Portishead collaborator John Baggott (most notably on "Atlas Air"), keys and synth bass from Damon Albarn ("Splitting the Atom" and "Flat of the Blade" respectively), guitar (various tracks) and bass ("Girl I Love You") by Neil Davidge and bass by Billy Fuller of Beak on various tracks.