'Piping' in the Bible

Why did you keep quiet among the sheep, hearing nothing but the watchers piping to the flocks?

And all the people came up after him, piping with pipes, and they were glad with great joy, so that the earth was shaking with the sound.

And it will be in that day that the Lord will make a piping sound for the fly which is in the end of the rivers of Egypt, and for the bee which is in the land of Assyria.