The Phantom Tollbooth
What do the people of the Valley of Sounds want Milo to do?
answer quick
answer quick
From the text:
"You must visit the Soundkeeper and bring from the fortress one sound, no matter how small, with which to load our cannon. For, if we can reach the walls with the slightest noise, they will collapse and free the rest. It won't be easy, for she is hard to deceive, but you must try."
The Phantom Tollbooth