Riddles about instruments

Here I put you some riddles about instruments, they are very easy.
Good luck!😊


When I open my mouth I teach
White and fine teeth.
When I start to talk,
All the others rhythmically move.



An old woman with a tooth
Which calls all people.



I have such a soft sound,
That angels touch me;
My strings accompanied
The psalms of King David.













The answers:
1. Piano.
2. Bell.
3. Harp.