Parallel hidden society with own laws and customs

Huldufólk

Despite their otherworldly nature, the Huldufólk are often portrayed as having a structured society with their own laws, customs, and hierarchies.

Tylwyth Teg

Accounts describe the Tylwyth Teg as capable of riding out in a fairy rade, their horses hung with jingling bells, and some tellings associate the sound of the bells with a general fondness for music rather than any single explained purpose.