Story by Nick Krewen | March 16, 2017 Decades before Jenson Vaughan became known as a hit maker for Madonna, Britney Spears and currently, High Valley, the Dartmouth, NS, native was in the dark about the artistry it took to write a song. So he plucked one out of the air. “I formed a little a capella group,” says Vaughan, recalling his high-school years. “And because of my jazz background,…