Opera-ballet is a theatrical genre that combines elements of both opera and ballet. It originated in the 17th century, particularly in France, where it was popularized by composers like Jean-Baptiste Lully. In this form, the performance features singing, orchestral music, and dance, often telling a story through a blend of these artistic expressions. The structure of an opera-ballet typically includes a series of short acts or scenes, each showcasing different dances and musical numbers. This format allows for a dynamic and visually engaging experience, appealing to audiences who appreciate both classical music and dance.