A Little Night Music is a musical with music and lyrics by Stephen Sondheim and book by Hugh Wheeler. Inspired by the Ingmar Bergman film Smiles of a Summer Night, it involves the romantic lives of several couples, with the music set almost entirely in waltz time. The musical included the song "Send in the Clowns". The title is an English (mis)translation of the German name for Mozart's Serenade No. 13 for strings in G major.