I was able to recognize the soundtracks except Dead Center and Dark Carnival (I couldn't hear it clearly, but help is appreciated)

L4D1
1. No Mercy - Killing Time (SH1)
2. Crash Course - Null Moon (SH2)
3. Death Toll - Walk on Vanity Ruins (SH3)
4. Dead Air - Black Fairy (SH2)
5. Blood Harvest - Fear of the Dark (SH1)
6. The Sacrifice - Peace & Serenity (SH2)

L4D2
1. Dead Center - ???
2. The Passing - Alone in the Town (SH2)
3. Dark Carnival - ???
4. Swamp Fever - Sickness Unto Foolish Death (SH3)
5. Hard Rain - Maternal Heart (SH3)
6. The Parish - A Stray Child (SH3)
7. Cold Stream - Promise "Reprise ver." (SH2)

Saferoom Theme : Float Up from Dream (SH3)
End Credits Theme : Letter - from The Lost Days (SH3)