How could Mongolian bards recite epics that were more than 20,000 lines long?

In the tradition of Mongolian literature, bards are able to recite epic stories that span more than 20,000 lines primarily through the use of highly stylized oral techniques.1

These orally transmitted verses, known as üligers, rely on specific structural devices that aid memory and performance:

• Stylized Verse: The epics are composed in couplets or quatrains that utilize alliterative verse, which provides a rhythmic framework for the performer.12
• Consistent Meter: The lines typically follow a set length of seven or eight syllables, creating a predictable cadence that assists in recall.1
• Parallelism: The use of parallelism throughout the narratives helps structure the flow of the story, making it easier for the bard to maintain the sequence of events.1

While these epics are genuine artistic creations, they function within a tradition where bards master these mnemonic structures to preserve and perform long, complex tales of legendary heroes and monsters from memory.1