What makes a xylophone vibrate?

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Tags

1. #metal
2. #vibration
3. #striking
4. #pushed
5. #produces
6. #tubes
7. #pitch
8. #length
9. #creating
10. #struck
11. #determined
12. #shorter
13. #xylophone
14. #sound
15. #these
16. #deeper
17. #produce
18. #longer
19. #stick