Hootie and the Blowfish ‘s Darius Rucker , R.E.M. ‘s Mike Mills , and the Black Crowes ‘ Steve Gorman have been quietly working on an album by their new supergroup, Howl Owl Howl, for the last five years — and it’s not quite done yet, except for the debut single “My Cologne.” But they decided to go on tour anyway, because at this point in their collective careers, Mills explains, they don’t have to follow rules. “ We don’t care,” Mills says on the new episode of the Rolling Stone Music Now