Task: Explanation
Input (English): Roméo et Juliette ("Romeo and Juliet") is an opera in five acts by Charles Gounod to a French libretto by Jules Barbier and Michel Carré, based on "The Tragedy of Romeo and Juliet" by William Shakespeare. It was first performed at the Théâtre Lyrique (Théâtre-Lyrique Impérial du Châtelet), Paris on 27 April 1867. This opera is notable for the series of four duets for the main characters and the waltz song ""Je veux vivre"" for the soprano. Question: What opera that starred William Martin was based on a play written by William Shakespeare? Answer: Roméo et Juliette
Output (English): Roméo et Juliette Romeo and Juliet is an opera in five acts by Charles Gounod to a French libretto by Jules Barbier and Michel Carré, based on The Tragedy of Romeo and Juliet by William Shakespeare.