In the strange Olympic summer of 1972, the Düsseldorf instrumental group (community of 5 hippies / open mind artists) German Oak entered the Luftschutzbunker (or Air Raid Shelter), in order to record their first self-titled LP. The purpose of recording in a bunker was to recreate the feelings experienced by German soldiers during the Allied invasion of 1944. The strange acoustic conditions in the bunker made the music, which was a series of long, spacious guitar jams, sound distant and filled with echo. Read more on Last.fm