OK, bear with me on this...
The first verse (sung by Vibeke) is known to everybody (''Not fear, nor tears...''), but the section were the choir explode with the instruments are unknown to mere mortals. But try to read the first real verse (''Dusk drawn hither...'') while listening to the choir. It almost sound like the verse! ''Dusk... drawn... hither... to... my... e... evening star... a... glance...''. I think this is very possible, as most interpretations are very ''out there'. Maybe it is this simple.
The second unknown section is the choir-parts after each verse, but I think it's the same thing. Listen very carefully while reading the lyrics for the first verse - and notice how the part ends in ''Veeenus!''. It fits!
The third and last part is around 4:40, but you can easily hear the choir chant ''Venus!''.
What do you think?