What is BGM system?

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Tags

1. #include
2. #zoning
3. #suitable
4. #music
5. #environment
6. #address
7. #public
8. #levels
9. #commercial
10. #playback
11. #normally
12. #system
13. #volume
14. #distributed
15. #plays
16. #element
17. #audio
18. #background
19. #continuous