Boss "D" – The Boss B variant that plays in Sector Y when you fight the two mini bosses.
Boss "E" – Also in Sector Y. Plays once the official boss appears.
Andross – Before you say it’s already in the distributed soundtracks and the game’s Sound Test, that variant is actually the one that plays when you fight Andross in his Android form.
If anyone is able to get these ripped, at least Boss D, that would be awesome.