Music of Tamil Nadu has a long tradition and history going back thousands of years. Music is a very important aspect of marriage and temple festival Tamil people. Ancient music The tradition of Tamil music goes back to the earliest period of Tamil history. Many poems of the Sangam literature, the classical Tamil literature of the early common era, were set to music. There are various references to this ancient musical tradition found in the ancient Sangam books such as Ettuthokai and Pathupattu. The early narrative poem Silappatikaram, belonging to the post-Sangam period also mentions various forms of music practiced by the Tamil people. Music was also utilised in the compositions of the Tamil Saiva saints such as Appar, Thirugnana Sambanthar and Manikkavasagar during the Hindu revival period between the sixth and the tenth centuries CE. The musical poet (sandakkavi) Arunagirinathar further embellished the Tamil musical tradition through his compositions of Tamil hymns known as Thiruppugazh. Pannisai Pann, which is the classical music form of Southern India, has a long history in Tamil Nadu. Later the name was mistakenly changed as Carnatic music. Even today Pannisai is sung in temple festivals. Tamil Nadu has produced a number of famous performers, as well as a closely related classical dance form Bharatha Natyam. Chennai hosts a large cultural event, the annual Madras Music Season, which includes performances by hundreds of artists. There are 72 basic scales on the octave, and a rich variety of melodic motion. Both melodic and rhythmic structures are varied and compelling. This is one of the world's oldest and richest musical traditions. Songs have been composed by great artists and handed down through generations of disciples. The composers belonging to the Tamil Trinity of Muthu Thandavar (1560 - 1640 CE), Arunachala Kavi (1712– 1779) and Marimutthu Pillai (1717–1787) composed hundreds of devotional songs in Tamil and helped in the evolution of Carnatic music. Three saint composers of the 18th to 19th Century, Tyagaraja, Muthuswami Dikshitar and Shyama Shastri, have composed thousands of songs that remain favourites among musicians and audiences. Today, Tamil Nadu has hundreds of notable carnatic singers who spread this music all over the world. M. S. Subbulakshmi, a renowned carnatic singer, had the honour of singing a song in the UN Security Council. Folk music Folk singing remains popular, especially in rural areas; elements of the traditional styles are sometimes used in film music. There