Anyways, for the uneducated:
The Erlkonig.
A supernatural being of german folklore, which means death.
It's a poem, which later got turned into a piece by Franz Schubert.
It's about a father riding a horse late at night with his sick child in his arms.
The boy tells him about the delusions he sees about the Erlkonig threatening to take him.
The poem ends with the father barely making it, and the child moaning in his arms, already dead.në