Left 4 Dead, a zombie infested first-person shooter, went into new territory for Valve in 2008. Hinging on a dynamic AI Director, the game reacts to your skill and movements by procedurally generating enemies, events and several other elements. Importantly, music is a huge part of that unpredictability. Mike Morasky eschewed a traditional score in order to play to the game's strengths, constructing a complex system that organically constructs personalised soundtracks for each session. I spoke to Mike for this L4D 1 & 2 special, which also features the Witch herself (Ellen McLain) and Jonathan Coulton - a popular songwriter who contributed to L4D2.

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