Imagine a rap battle, between two competing, freestyling artists. But instead of rappers, you've got Vietnamese villagers. And instead of rhyming lyrics, you’ve got folk music infused with poetry and lullabies. Now set it all in 13th-century northern Việt Nam. That’s what you get with quan họ, traditional call and response folk music. Loa’s Jenny Lý gives us a sample of this singing style.