Macbeth is an opera in three acts, with music by Ernest Bloch to a libretto by Edmond Fleg, after the eponymous play of William Shakespeare. Bloch composed the opera between 1904 and 1906, but it did not receive its first performance until 30 November 1910 by the Opéra-Comique in Paris with Henri Albers in the title role and conducted by François Ruhlmann. Alex Cohen has written of quarrels within the cast that contributed to the opera's poorly received premiere.