ORIGINALLY POSTED ON STRAIGHT.COM, OCT. 23, 2013 By Steve Newton What do Elvis Costello, Ben Harper, Dr. John, Grace Potter, Steve Winwood, and Dave Matthews have in common? Well, apart from the fact that they’re all certified rock stars in their own right, they each sang lead on a track on Shout!, the new album from … Continue reading The stars came out for Gov’t Mule’s Shout!