"Where All Is Fled", by Steve Hauschildt.
This piece of music manages, in four blissful minutes, to hit the sweet spot between three of Brian Eno's most important albums (well, to me, anyway), "Another Green World", "The Pearl" (with Harold Budd), and "Music For Films". (You can, if you like, throw in "Apollo" for good measure.)
On that analysis, you might consider it to be somewhat derivative. But when a song is this gorgeous, it would be churlish to quibble.