Vienna is home to Mozart and his wonderful music that to this day the towns people play daily at concerts. You can attend one of many concerts where the musicians are dressed in the period.
You will love to hear all those Viennese waltzes and those are not frankfurters at the cafes but sausages, however when you question the waiter he will admit that they call them frankfurters too. Make sure you get the fresh saurerkraut and a stein of beer to go along with your dish.