Joe Schreiber posted the playlist he created while writing and editing the manuscript of Supernatural: The Unholy Cause.
"In a perfect world, the book would come with a CD, or at least a little flash drive you could drop in your laptop and listen to these tunes while you read the book."
Supernatural: The Unholy Cause will be released on April 20, 2010.
Source: Joe Schreiber Blog.