This is a selection of atmospheric music which makes good 'background': it is unobtrusive enough that it does not intrude, yet creates an ambience suitable for the Deadlands Noir setting... easy listening, yet suggesting the kind of environment that you and your group is trying to create as you play.

I particularly enjoy 'specially written for the game' soundtracks because they do not distract the players when you put them on. It's often quite easy to find existing music that fits the mood and the game that you are planning but when you actually start to play, people get distracted by trying to identify music they've heard before or start to draw their own conclusions based on their past experiences or knowledge of the music. It can be good when planning and writing an adventure, though... but this original themed music is far superior when the dice come out!