Queen Mab is a fairy referred to in William Shakespeare's play Romeo and Juliet, where "she is the fairies' midwife". Later, she appears in other poetry and literature, and in various guises in drama and cinema. In the play, her activity is described in a famous speech by Mercutio published originally in prose and often adapted into iambic pentameter, in which she is a miniature creature who performs midnight pranks upon sleepers. Being driven by a team of atomies, she rides her chariot over their noses and "delivers the fancies of sleeping men". She is also described as a midwife to help sleepers "give birth" to their dreams. Later depictions have typically portrayed her as the Queen of the Fairies.

Roméo et Juliette is a seven-movement symphonie dramatique for orchestra and three choruses, with vocal solos, by French composer Hector Berlioz. Émile Deschamps wrote its libretto with Shakespeare's play as his base. The work was completed in 1839 and first performed on 24 November of that year, but it was modified before its first publication, in 1847, and modified again for the 2ème Édition of 1857, today's reference. It bears the catalogue numbers Op. 17 and H. 79. Regarded as one of Berlioz's finest achievements, Roméo et Juliette is also among his most original in form and his most comprehensive and detailed to follow a program. The vocal forces are used in the 1st, 5th and 7th movements.