I finished listening to Disc 2 this morning, and I'm surprised to find that I don't find "The Moon is a Window to Heaven" at all unpleasant. I haven't actually listened to it (beyond the version in the film proper) since I bought the soundtrack album back in '87 or whenever. The lyrics are a bit weak, and too Earth-centric for a diegetic song in a space movie (I imagine listeners on many worlds would've responded, "Which moon?"), but the melody's not bad and the pseudo-Asian percussion line is interesting. It's very '80s, with the Synclavier and such, but then, the source music in TOS tended to be rather '40s-sounding, so I can't complain.
And the liner notes are clearly wrong to say that the film version is Nichols's voice. It doesn't sound a thing like her beyond being soprano. Heck, I knew that when I first saw the film.
In other news, the problem with those CD racks that have an individual slot for each CD case is that if you want to insert a new disc near the start of the row, you have to tediously move everything over one by one.