"Das Lied vom blauen Paradies" from the operetta "Ein Tag im Paradies" ("The Blue Paradies") "Das Lied vom blauen Paradies" from the operetta "Ein Tag im Paradies" ("The Blue Paradies") Main opus "Ein Tag im Paradies" ("The Blue Paradies"), operetta in 3 acts, libretto by by Leo Stein and Béla Jenbach