It can be anything you want with the exception of music-only videos, even with still photographs (as there is another thread for that in the Music forum)
Live performances are OK.
If you would be so kind as to list the name of the video as well, because lots of them get pulled if they all of a sudden get a lot of hits, but sometimes they are still around on another user’s account.
From a guy’s rom-com, Candice tries to woo her ex back, who/whom she previously dumped (who is now happily involved with someone else), before becoming a famous songwriter (not singer), with a song she wrote for them.
Candice Bergen sings “Better Than Ever” in Starting Over (1979):