Music form is a broad term that encompasses many different genres and styles. Sonata is a classical music form that originated in the Baroque period and is typically composed for a solo instrument or small ensemble. It is usually in three or four movements and often has a recurring theme. RAP is a modern musical form that emerged in the late 1970s and is characterized by spoken word lyrics over a beat. It is often used to express social and political issues and has become one of the most popular genres of music.