Drum Shanties

started on the migration from the deep.
example: misty mountain song from the hobbit.
percusion and group singing. Some of them date back to the exodus from the underground. These hold some secrets / ominous references to the fomori that people believe are myth. There arent written records from this time (and dwarves wouldn't settle into permanent housing until 200 years later) so people tend to think these references are metaphorical. myth.