What is a passacaglia in music?

Related questions

1. What's the difference between a canon and a fugue?
2. What's the prelude?
3. How does a fugue work?
4. What does La Passacaglia mean?
5. What is the difference between Chaconne and Passacaglia?
6. Why is Bach so important?
7. What does BWV mean music?
8. What does BWV 565 mean?
9. What are the three main sections of a fugue?
10. How do you pronounce cello instrument?

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5. #ostinato
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13. #seventeenth
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19. #composers
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21. #usually