Why isn't my iTunes working on my Mac?

Related questions

1. How do I enable iTunes on my iPhone?
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Tags

1. #doesn
2. #answer
3. #reinstalling
4. #updated
5. #another
6. #update
7. #itunes
8. #option
9. #clicking
10. #start
11. #launching
12. #apple
13. #accounts
14. #command
15. #software
16. #press
17. #account