Ballad Opera is a 18th century English theatre form featuring popular tunes, folk songs, and spoken dialogue. It began with operas using existing ballads or folk songs with new words added. A key example is The Beggar's Opera from 1728, which combined lyrics with familiar tunes. Ballad Operas attracted middle to upper class audiences and allowed both women and men to perform, unlike Greek theatre which only featured male actors for women's roles. They also advanced from Greek musicals by having fully sung dialogue rather than sometimes spoken parts.