Well over one thousand musical compositions have been inspired by Hugo’s works from the 1800s until the present day. In particular, Hugo’s plays, in which he rejected the rules of classical theatre in favour of romantic drama, attracted the interest of many composers who adapted them into operas. More than one hundred operas are based on Hugo’s works and among them are Donizetti’s "Lucrezia Borgia" (1833), Verdi’s "Rigoletto" (1851) and Ernani (1844), and Ponchielli’s "La Gioconda" (1876). Hugo’s novels as well as his plays have been a great source of inspiration for musicians, stirring them to create not only opera and ballet but musical theatre such as Notre-Dame de Paris and the ever-popular Les Misérables, London West End’s longest running musical. Additionally, Hugo’s beautiful poems have attracted an exceptional amount of interest from musicians, and numerous melodies have been based on his poetry by composers such as Berlioz, Bizet, Fauré, Franck, Lalo, Liszt, Massenet, Saint-Saëns, Rachmaninov and Wagner.