Sandy Rubinstein, CEO at DXagency, started her career though an unusual route. Classically trained as an opera singer, she pursued a dual major of music and business in college. "I took all of these business and marketing courses while I was taking music courses," she recently told me. "In the evenings, I would be performing at an opera and in the daytime, I might be studying accounting. But it was great because it gave me a broad sense of the possibilities."