Work music is a broad term that encompasses any type of music created for the purpose of being used in a professional setting. The most common type of work music is known as an opus, which is a musical composition of considerable size and complexity. An opus typically consists of multiple movements or sections, each of which has its own distinct character and style. Opuses are often composed for specific purposes, such as to accompany a theatrical performance or to be used as background music in a film or television show.