A notable music tradition is the Baul music, practised by the Bauls, a sect of mystic minstrels.[179] Other folk music forms include Gombhira and Bhawaiya. Folk music in West Bengal is often accompanied by the ektara, a one-stringed instrument. Shyama Sangeet is a genre of devotional songs, praising the Hindu goddess Kali; kirtan is devotional group songs dedicated to the god Krishna.[180] Like other states in northern India, West Bengal also has a heritage in North Indian classical music. Rabindrasangeet, songs composed and set to words by Rabindranath Tagore, and Nazrul geeti (by Kazi Nazrul Islam) are popular. Also prominent are Dwijendralal, Atulprasad and Rajanikanta's songs, and adhunik or modern music from films and other composers.[181] From the early 1990s, new genres of music have emerged, including what has been called Bengali Jeebonmukhi Gaan (a modern genre based on realism). Bengali dance forms draw from folk traditions, especially those of the tribal groups, as well as the broader Indian dance traditions. Chhau dance of Purulia is a rare form of masked dance.[182]