Warren Haynes has been in dozens of musical scenarios since starting his career in the 1980s as a combustible guitar-slinging sideman and front person. He's been a brother within the Allmans' framework, performed with orchestras, and acted as a sessioneer to the diverse likes of Dave Matthews, John Scofield, David Allan Coe, and more. His dense and blustery Gov't Mule put him at the top of the heap of hard-jamming blues players and collaborators.
But it was playing with the Dead (once Grateful) and whatever permutations of its membership he's been a part of that has lent Haynes and his floating set lists a sense of mystery, and more than a little psychedelic soul. Having interviewed him, this writer can attest that he gives no hints as to what he and/or his raging-hot Gov't Mule will play.