A joyful and festive Bach birthday cantata for ruler Friedrich August II, “Schleicht, spielende Wellen,” (Glide, playful ripples) whose four vocal soloists—Laura Heimes, Meg Bragle, Aaron Sheehan and Randall Scarlata—each personify a river to acclaim the good they bring to the realm. Plus Telemann’s Hamburger Ebbe und Flut (Ebb and Flow) – a grand orchestral portrayal of tides, merry boat-people and watermen falling in love.