Some artists who write instrumental tunes claim that naming them is difficult. I don’t know. I’m always coming up with weird phrases that seem to have no other purpose on Earth other than to be a jazz or fiddle tune, some of which are named with surreal panache. Consider two of the tunes April Verch played in her show-opening set of Canada-inspired traditional music: “Spider Bit The Baby” and “Joke On The Puppy.” One has to wonder what circumstances way back wherever in time led somebody to affix those words to those churning bundles of notes and rhythms. In my mystery lies stories of our own making. That’s what’s fun about instrumental music in general; we can bring a lot of ourselves to a tune’s meaning when the singer isn’t telling us what to think. Even so, on this balmy March 1 night as we closed our winter 2017 season, the singers and songwriters gave us plenty to think about as well. It was a well-rounded, head bobbing kind of an evening that started in Canada and ended up in South Carolina.