VI
And it's half of their longtime sonic logo:
Early 1990s:
1995:
2015-present:
By the way, CNN's distinctive four-note musical signature from that era lives on in the current Breaking News theme:
https://www.youtube.com/watch?v=JD6xT5_a2Y4
https://www.youtube.com/watch?v=JD6xT5_a2Y4
And it's half of their longtime sonic logo:
Early 1990s:
1995:
2015-present: