Hindi dance music, popularly referred to as Bollywood, is now widely listened to around the world. Bollywood music first became popular among overseas Indians and was eventually discovered by others. The filmi music and dances in Bollywood films are a synthesis of formal and folk Indian traditional music and dance traditions, infused with Middle Eastern techniques. The dances in older Hindi movies represented supposed dances of the common people, although they involved original choreography. Bollywood dances have evolved as a unique and energetic style. Since Bollywood is essentially comprised of group dance music, it is often used as joyful exercise music. The Bollywood dance form usually follows such Bollywood music. The choreography of Bollywood dances takes inspiration from Indian folk dances, classical dances (like kathak), as well as disco and earlier Hindi film dances.