all rap videos can be divided into one of four categories:
1. baller/pimp (sometimes on a boat; cristal is featured)
2. action movie (lots of guns/possible shootout with cops)
3. love story (any usher video where he's probably sitting on a bed)
4. in the hood (getting back to the streets, close-up shot of spinning rims/dice games necessary)

i suppose there's also the video with any blank white or black background that's meant to be artistic and minimalistic (think snoop and pharrell in "drop it like it's hot").

...or that d'angelo video.