As inspired by this post:

1. NBA on NBC ("Roundball Rock")

2. NFL on Fox

3. College basketball on CBS

4. NBC Olympics

5 (tied). Sunday Night Football

5 (tied). Monday Night Football

7. Hockey Night In Canada ("The Hockey Theme")

8. College Football on CBS

9. NBA on TNT

10. NHL on ESPN

11. NFL on CBS (mid-'90s)

12. MLB on ESPN

13. NHL on NBC

14. NBA on ABC/ESPN

15. MLB on Fox

16. NFL on CBS (current)

[...]

736. NHL on ESPN2

737. The Masters

738.

739. Whatever hot garbage NBC used for the NFL in the pre-SNF days