What is ABAC form in music?

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2. #music
3. #classical
4. #through
5. #ideas
6. #tradition
7. #commonly
8. #popular
9. #composed
10. #structures
11. #uncommon
12. #means
13. #songs
14. #variation
15. #highly
16. #musical
17. #called
18. #repeated
19. #mainly
20. #without