I would prefer panic/paranoid/horror
That's what I thought initially too, but really, the ZS gamemode is much more action oriented than scary.
True, but it creates a sense of tension and suspense. I hope this track revitalizes the original song and makes it less bland while not scaring fans of the original away. Make it too different and a much larger amount of people may get upset with it.
That's what I was thinking. Maybe I'll just make different packs, one to be used on the actual server, and one people can use to replace locally in their Gmod folder or something.
The one used on the actual server will be more faithful to the original. I might just remaster them instead of making new tracks, if I decide to do that.