Raised in the mountains and wild ravines,
I have become the herald of hymns that are sung.
I have no articulate voice, but still my voice is melodious.

I found this quite by accident. It is a riddle from the Planudean anthology of problems and riddles, Chapter 7, #65. I don’t have the answer. I have a guess at what it might be.

Please leave your guesses in the comments.