The Mello Code - Music
by MRS Jeevas and Saigocage

Playlist, minus the last one, which I can't find nor even remember what it was!

John Murphy's 28 Days Later OST (full album):

John Murphy's 28 Weeks Later OST (full album):

Listening to both of them now (and the Nightwish tracks) totally evokes the feeling of writing this novel. I must have worn my CDs out playing them all on repeat for various chapters.