Hearing this brings back some old memories 

I do not Own Any copyright on that track .. all credit goes to composer ..Left 4 Dead Main Menu Theme

Left 4 Dead Main Menu Theme

Left 4 Dead - No Mercy

Dark Carnival Main Menu Theme made by Valve Studio Orchestra

Intro song from Left 4 Dead 2 OST
Disclaimer: I don't create this song. All rights belong to Valve.

Campaign end theme from Left 4 Dead 2 OST.
Disclaimer: I don't create this song. All rights belong to Valve.