Ruggero Leoncavallo was an Italian opera composer and librettist. Although he produced numerous operas and songs throughout his career it is his opera Pagliacci (1892) that remained his lasting contribution, despite attempts to escape the shadow of his greatest success.

Opera is a form of theatre in which music is a fundamental component and dramatic roles are taken by singers. Such a "work" is typically a collaboration between a composer and a librettist and incorporates a number of the performing arts, such as acting, scenery, costume, and sometimes dance or ballet. The performance is typically given in an opera house, accompanied by an orchestra or smaller musical ensemble, which since the early 19th century has been led by a conductor. Although musical theatre is closely related to opera, the two are considered to be distinct from one another.