Gov’t Mule have announced two shows at the Tower Theatre on Friday, December 27th and Saturday, December 28th with special guests Soulive. Tickets go on sale Friday, October 4th. Go here for tickets and more information. Guitarist and singer Warren Haynes and the Mule have just released a new double album, Shout. The first disc is a collection of new material and Shout’s second disc includes Elvis Costello, Steve Winwood, Ben Harper, Dave Matthews, Dr. John, Toots Hibbert, Grace Potter, and Jim James, who each recorded an alternate vocal performance of one of the first disc’s new Gov’t Mule tunes. Below, listen to Gov’t Mule’s version of “World Boss” and Ben Harper’s alternative take on the song.