The first epics were products of preliterate societies and oral history poetic traditions. Oral tradition was used alongside written scriptures to communicate and facilitate the spread of culture.In these traditions, poetry is transmitted to the audience and from performer to performer by purely oral means. Early 20th-century study of living oral epic traditions in the Balkans by Milman Parry and Albert Lord demonstrated the paratactic model used for composing these poems. What they demonstrated was that oral epics tend to be constructed in short episodes, each of equal status, interest and importance. This facilitates memorization, as the poet is recalling each episode in turn and using the completed episodes to recreate the entire epic as he performs it. Parry and Lord also contend that the most likely source for written texts of the epics of Homer was dictation from an oral performance.