Dvorak composed the great Czech national opera, Rusalka in a single burst of inspiration between April 21 and November 27, 1901, to a text by Jaroslav Kvapil based on Hans Christian Andersen. Rusalka is a Bohemian 'Little Mermaid'. In the aria Mesiku na nebi hlubokem (The Song to Moon), Rusalka has fallen in love with a Prince. Unfortunately, Rusalka is a water sprite and cannot come out of the water or communicate with him. She asks the moon to tell her love that she is thinking of him. The Song to the Moon is without any doubt the most famous aria from the opera and is used in commercials as well.