This story originally appeared on RealTime/STL. The Opera Theatre of St. Louis joined St. Louis’ birthday celebration Tuesday night. The “surprise” Spring Sing chorus, which included dozens of singers from the St. Louis community, swarmed Kiener Plaza ahead of the St. Louis Cardinals game. It's the big day! #Springsing tonight at 6:30. Make sure you… Continue reading Opera Theatre sings ‘Happy Birthday’ to St. Louis