Ambient 4: On Land (1982)

The last of Brian Eno's Ambient series trades the calm of Music for Airports for half-remembered places, built from tape, struck chains and recordings of rooks, frogs and insects. Eno called it a disturbed landscape, and that is exactly the feeling: a pastoral surface with something low rumbling underneath, like crossing a marsh at dusk where the ground is not quite solid. Lizard Point is the gentlest way in. Intensity: subtle. Nothing jumps out; the unease builds slowly through the murk.