Dangit, are you sure it was never on any of the soundtracks? You said that you had like bootleg copies so, maybe on an Original it had it? Maybe not, but the song is excellent and I want to get a hold of it... Bleh...
Yes, most of them ARE bootlegs, but they're
good bootlegs. In fact, they're exactly identical to the real deal, except for the extra logo and non-PICA serial number. No, I'm afraid some BGMs just never make it to soundtrack. I do recommend going through everything available to you in a couple of the CDs in the 6 CD set, however. That has quite a few excellent BGMs that are very game-worthy.