Sang in this once, with a relay conductor and hidden behind a screen. We left the room and went down some stairs and outdoors before we stopped singing the final two chords, then the clock chimed. Unplanned but awesome.
I know there are different versions of the planets, and some are just lame. But if you have the right one... I think mine is London Symphony Orchestra, probably from 80's or early 90's... and this song, when the voices come in.. is the creepiest thing ever. I imagine freefalling into Neptune from space, everything feels so cold, dark, and far away.