Regardless of what one thinks of this film overall the soundtrack is fantastic.
I agree completely with that. I have that 3 disk set too, and hearing it after listening to the 15 disk series set gave me a new appreication for Goldsmith's score.
That said though, I still think that title song does not suggest "space", so much as it reminds me more of an 1890's (or whatever decade that was popular) Barbershop Quartet.
I have no idea why that is, that's just what that title music reminds me of.