Tangerine Dream's 1975 album picks up where 1974's Phaedra left off--with sequenced teases of palpitating synth under ambient washes of cosmic sound and traces of melody. If Phaedra was the marsh of dank electronic washes and eerie sounds in the night, Rubycon is that marsh just before dawn, awakening in a dusky light of bubbling metallic sequences and murky movements of lush synth. There's plenty of dreamy sections here, continuing on for several long delicious moments while creating a cosmic space that hovers between the unconscious and awakening. "Rubycon, Part II" builds an electronic wind tunnel of sound before breaking like a sunbeam through a cathedral and soaring into softly urgent skies of nuanced melody. The piece moves as an ocean wave, washing gently into a shore of tinkling cosmic rocks that reverberate and find hints of subtle, aching harmony before finally evaporating into the album's end. A brilliant ambient work.