If you haven't heard of Them Coulee Boys, you will. This Wisconsin band named after unusual geography (and technically, incorrect grammar) blends bluegrass, rock and punk into a style of Americana that's expanding to new audiences with a new album and tour. Lead singer Soren Staff talks with Eric Paulsen about what's ahead and what they've seen in the changing music business since they formed - at camp, of all places - in 2013.