How does a xylophone make waves?

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Tags

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