[Raynor]

Developing a drum-message system is very like developing an original language, but we don't have any evidence of drum-messages in any other Tolkien culture.

I disagree:

Originally Posted by The ride of the Rohirrim

- Is the enemy coming then? asked Merry anxiously. Are those their drums? I began to think I was imagining them, as no one else seemed to take any notice of them.
- Nay, nay, said Elfhelm, the enemy is on the road not in the hills. You hear the Woses, the Wild Men of the Woods: thus they talk together from afar.