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Harmonia, Cluster and specifically Michael Hoenig's "Departure from the Wasteland."
Top three personal favorites of all-time are easily, in no particular order:
1.) Amon Duul II - Phallus Dei
2.) Ash Ra Tempel - S/T
3.) Cluster - Sowiesoso
Harmonia, Cluster, Ashra, Ash Ra Tempel, Amon Duul I & II, Manuel Gottsching, Gunter Schickert, Klaus Schulze, Heldon, Richard Pinhas, Ose, Grails, GHQ, Sungod, Adelbert Von Deyen, Kluster, Tangerine Dream, Conrad Schnitzler, Agitation Free, Barn Owl, Can, Cloudland Canyon, Cybotron, Dieter Moebius, Conny Plank, Earthstar, Roedelius, Expo '70, Wolfgang Bock, Achim Reichel & Machines
The breathing, gestating universe