Early '70s folk singer Sibylle Baier.
This is her only album, released (finally) in 2006.
"Sibylle Baier, a housewife and mother, recorded Colour Green at her German home on a reel to reel tape machine between 1970 and 1973. Upon finishing the recording, she gave out a few copies and retired the master tapes to the attic of her home. The tapes remained forgotten for 30 years until her son discovered them. He sent out cassettes of the recording, which led to the release of the album (in part courtesy of J Mascis of Dinosaur Jr)."