Trash Band

The Trash Band is a group of people who are seen to make music(?) with trash found in the forest. The song they play is nonsense, however, it could also be symbolism for the unhealthy state of the earth and the nonsensical nature of littering.

The Trash Band made its first appearance in the fourth episode of the first season titled "Your guide to living in a world with tunnels & trash bands"

It is uncertain what beings the trash band consist of, but it is clear that they possess the ability to reverse time individually, as one of the members is in a constant loop of throwing an object (presumably a rock) at the trash.