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Since an overtone-spectrum, due to its nature, contains an infinite number of diverse tones which appear as individual overtones, their different combinations result in an endless variety of musical sound-space structures –
4. 4, 5, 11. 20, 21, 18. 32, 33

an infinite diversity of tonalities.

The conscious perception of overtones in our sense of hearing

1.-3. 3, 11. 21, 12.-14. 22, 18. 33, 19. 34
1.-3. 2, 3, 12.-14. 22, 23, 19.-21. 34, 35
4. 5, 5. 6, 10. 19, 11. 20, 17. 31, 18. 32

depends on the delicacy of our hearing ability. The further away the overtones are from the basic tone, the finer is their structure, the fainter the sound,
4. 4, 5, 11. 20, 21, 18. 32, 33

and hence the more difficult they are to hear. Also, they are much closer together, and thus much more difficult to differentiate.
1.-3. 3, 11. 21, 12.-14. 22, 18. 33, 19. 34
1.-3. 2, 3, 12.-14. 22, 23, 19.-21. 34, 35
4. 4, 5, 11. 20, 21, 18. 32, 33
5. 7, 8, 6. 11, 7. 12, 8. 13, 9. 14, 10. 17, 18, 15. 25, 16. 26, 17. 29, 30
6. 11, 7. 12, 8. 13, 9. 14, 15. 25, 16. 26