Romeo and Juliet sometimes been judged unfavourably because of its perceived liberties with Shakespeare; however, Bellini and his librettist, Felice Romani, worked from Italian sources—principally Romani's libretto for "Giulietta e Romeo" by Nicola Vaccai—rather than directly adapting Shakespeare's play. Among later operas, there is Heinrich Sutermeister's 1940 work "Romeo und Julia". "Roméo et Juliette" by Berlioz is a "symphonie dramatique", a large-scale work in three parts for mixed voices, chorus, and orchestra, which premiered in 1839. Tchaikovsky's "Romeo and Juliet" Fantasy-Overture (1869, revised 1870 and 1880) is a 15-minute symphonic poem, containing the famous melody known as the "love theme". Tchaikovsky's device of
Romeo and Juliet the play's "twin themes of love and the total breakdown of understanding between two generations" had contemporary relevance. Recent performances often set the play in the contemporary world. For example, in 1986, the Royal Shakespeare Company set the play in modern Verona. Switchblades replaced swords, feasts and balls became drug-laden rock parties, and Romeo committed suicide by hypodermic needle. In 1997, the Folger Shakespeare Theatre produced a version set in a typical suburban world. Romeo sneaks into the Capulet barbecue to meet Juliet, and Juliet discovers Tybalt's death while in class at school. The play is sometimes given a historical