How much of a song can you use without paying royalties?

Related questions

1. Why does Spotify sound better than iTunes?
2. Does Spotify work without Internet?
3. Does Spotify work without wifi?
4. Can I use no copyright music?
5. How much does Spotify premium cost?
6. Is downloading music without paying illegal?
7. Is it worth it to pay for Spotify?
8. Is Spotify free forever?
9. Is play music free?
10. Is Musi app free?

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2. #understand
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7. #short
8. #answer
9. #without
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14. #works
15. #heard
16. #paying
17. #seconds