Highly relevant in studying non literate societies. Their knowledge, values, belief, culture is transmitted orally. It contains their songs, folklore, mythology, knowledge, history and so on.
Represents collective wisdom of society over generations
Australian aborigines have very rich oral history. Studied Indian tribe Oraon sc Roy using their oral traditions. Ethnoarchaeology.
Limitations. Historical accuracy questionable. May have been altered by outside contact. Hidden meaning and symbols may not be known to the researcher or even the community at present. Maybe exaggerated. Chronology cannot be ascertained.
Bhil of Gujarat Singh songs about their battle with the Britishers.