After 13 years in the making, the soundtrack to John Mellencamp and Stephen King's long-awaited musical, Ghost Brothers of Darkland County, was finally released today (Tuesday). It is available in numerous formats and in addition to Mellencamp, it also features Elvis Costello, Sheryl Crow, Kris Kristofferson, Rosanne Cash and many others.

The show will tour theaters this fall. According to Mellencamp, it's about "two brothers who are very competitive and dislike each other immensely. The father takes them to the family vacation place, a cabin that the boys hadn't been to since they were kids. What has happened is that the father had two older brothers who hated each other and killed each other in that cabin. There's a confederacy of ghosts who also live in this house. The older [dead] brothers are there, and they speak to the audience, and they sing to the audience."

Mellencamp and King will plug the soundtrack's release with appearances Wednesday on The Late Show With David Letterman as well as Comedy Central's Colbert Report.

John Mellencamp on the story behind Ghost Brothers of Darkland County:

Stephen King and John Mellencamp on how they came to write a musical together: