Tetragon, from the north of the country formerly known as West Germany, released but one album of instrumental jazz-rock that purported to say something about their concern for the environment and the effect mankind was having on the natural world. Nature (1971) is something of a lost progressive rock classic, most deserving of the attention of the wider world. Not sure if the album is currently available, though it was re-released in 1995 by Musea Records of France. I think you can get hold of a download all legal like via Amazon or else I'd imagine that a trawl of the internet will find you a suitable blog with the usual links. Really rather groovy. What guitars and keyboards were made for, surely?