For musical theater fans, today is an international holiday! March 22 marks musical theater legends Stephen Sondheim and Andrew Lloyd Webber’s birthdays. In honor of this truly magical day of theater-dorkdom, we’ve created a quiz so you can finally figure out which of their beloved songs is your true anthem. (You already known our top 50 favorites from Sondheim and Lloyd Webber.) Take our quiz below, share your results with us on Twitter and (why not?) belt out your answer to celebrate these Tony-winning titans’ big day.