Folk music consists of songs and music of a community that are uninfluenced by any sophisticated musical rules or any standard music styles. Bangladesh has a heritage of rich folk music which includes both religious and secular songs. Folk music may be described as that type of ancient music which springs from the heart of a community, based on their natural style of expression uninfluenced by the rules of classical music and modern popular songs. Any mode or form created by the combination of tune, voice and dance may be described as music. Thus, the combination of folk song, folk dance and folk tune may be called folk music. For example, Baul songs are a combination of tune, music and dance. In Bangladesh folk music has great variety with songs being composed on the culture, festivals, views of life, natural beauty, rivers and rural and riverine life. These songs are also about social inequality and poverty, about the material world and the supernatural. Mystical songs have been composed using the metaphors of rivers and boats. Since the country is basically riverine, the Bhatiyall forms an important genre of folk music. Folk music is formed and develops according to the environment. Differences in the natural environment are reflected in the people of the different regions. The dialects too vary across the different regions. Bangladeshi folk music therefore varies from region to region.