I do not own any of the music featured in this video nor is there any attempt at financial gain from uploading this.
The Eranthis Soundtrack replaces and even adds music from various artists, games, and movies into your Left 4 Dead 2 game. The mod is out now on L4DMaps. The installation of this mod does require some manual tweeks to your game's directory. A video will be posted later showing how to. Mod features more than shown in the video and also includes a song list giving you the names of all the songs and the soundtrack they were from.
Mod does not include (yet):
Dead Center Opening
Hard Rain Opening
Death Toll Opening
The Sacrifice Opening
Left 4 Dead 1 Contagion
Death Toll Contagion
Blood Harvest Contagion