That very distinguishable music score should remind dark creepy corridors of doomed space station full of crew corpses and haywire robots trying to turn you into obedient cyborg. That game was a legend. Of course not as much as the Doom, the absolute legend.
Music reminding any of these games is at least ridiculous in p0rn game :-)
Creating serious music playlist for HTH was never my intention. After all there would have to be 1000 playlists to get the right one for everyone.
My intention was to make it easy for everyone to create his own. Please open hth_config.xml (of 0.671) in simple text editor, look at playlist definition tags. Please verify that that it's easy enough (at least for you) to create your own fourth playlist. My perception of "easy" may be wrong as turned out with XML dialogs.