Officially Brian Eno’s last Ambient series entry, but hardly his last release in that general vein, 1982’s Ambient 4: On Land has since become one of the standard bearers of the genre as such, eight instrumental pieces of beautiful but ghostly, uneasy impact. While a variety of guest performers appeared throughout, including Bill Laswell, Michael Brook and Daniel Lanois, it’s mostly Eno reworking snippets of old sessions, field recordings of animals and other textures into remarkable compositions as “The Lost Day” and “Dunwich Beach, Autumn, 1960.”