1st song is the overall theme for the apocalypse / godspeed you black emperor, dead flag blues

2nd song plays when you kill your first zombie / army of the pharaohs, contra mantra

3rd song plays when getting chased by a horde / the beatles, helter skelter

4th song plays when you have to kill your loved one / god is an astronaut, snowfall

5th song plays when you find survivors / rolling stones, sympathy for the devil (this is going to make sense around the 9th song i promise)

6th song plays when you meet a new love interest / bright eyes, lover i don’t have to love

7th song plays when you make a final stand / ennio morricone, il triello

8th song plays when you think you’ve survived it all / half life 2 soundtrack, triage at dawn remix

9th song plays when you discover a bite mark on yourself / bob dylan, the times they are a-changin’

10th song plays over the end credits / radiohead, exit music (for a film)