How many octaves could Freddie Mercury's voice?

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2. #freddie
3. #extraordinary
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5. #substantiated
6. #octaves
7. #distinctive
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9. #mercury
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11. #range
12. #technique
13. #growling
14. #singer
15. #queen
16. #singing
17. #research
18. #spanning
19. #shown
20. #unusual
21. #music
22. #claims