For their upcoming album, 'Shout!,' Gov't Mule will offer fans a two-CD experience with the second disc filled with guest collaborations. Steve Winwood, Dr. John, Elvis Costello and others will appear on re-recorded versions of songs found on the first disc.

Warren Haynes told ABC News Radio that "somewhere along the line we took this drastic left turn onto a dirt road that led us to the idea of, 'What would happen if we offered a bonus disc of all these same songs but with other singers singing them?'"

The guitarist -- who also plays with the Allman Brothers Band -- is friends with most of the musicians. They also happen to be some of his favorite artists. You can see the complete track list of the second disc below. The songs may run in different orders on the two discs.

The tracks on 'Shout!' -- which comes out on Sept. 24 -- embody everything the band has done over the past year, Haynes said. "It kind of shows influences that we've always had that have never come to the surface until now," he said.

Look for a special concert that includes many of the guest artists sometime in the future. No details on that yet. Gov't Mule return to the U.S. for the Gathering the Vibes Festival on July 27. They are currently on tour in Europe.

Govt' Mule's 'Shout!' Disc Two Track List
'World Boss' (Feat. Ben Harper)
'Funny Little Tragedy' (Feat. Elvis Costello)
'Stoop So Low' (Feat. Dr. John)
'Captured' (Feat. Jim James)
'Whisper in Your Soul' (Feat. Grace Potter)
'Scared to Live' (Feat. Toots Hibbert)
'No Reward' (Feat. Glenn Hughes)
'Bring on the Music' (Feat. Ty Taylor)
'Forsaken Savior' (Feat. Dave Matthews)
'Done Got Wise' (Feat. Myles Kennedy)
'When the World Gets Small' (Feat. Steve Winwood)