Tanzania's literary culture is primarily oral. Major oral literary forms include folktales, poems, riddles, proverbs, and songs. The greatest part of Tanzania's recorded oral literature is in Swahili, even though each of the country's languages has its own oral tradition. The country's oral literature has been declining because of the breakdown of the multigenerational social structure, making transmission of oral literature more difficult, and because increasing modernisation has been accompanied by the devaluation of oral literature.