Depends on the type of music and the director of the music video. Most videos can either explain the story better then the lyrics (Depending on encryptic writting, etc.) or they can add to the overall expression of the song in question.
Most of the Pop videos out there are about as equal in quality as some of the music, such as punk rock crap music..... Garbage In.... Garbage Out. How many more videos do we need to see of some skinny and oily kids trying to act tough and cool in a super market, riding in shopping carts and ripping bags of chips all over the isles?
Absolute Crap and a waste of everybody's life. Yeah, you're the big rebel against the big machine alright..... probably don't even know that the Machine is.
Mommy's vibro perhaps?
But there are some really good ones out there and if you're into art and visual stimulation, it's easy to appreciate these types of videos.
Perfect example: Pink Floyd The Wall.
Yes it was a movie, bu it was also one big music video.
I figured it was telling a story.... much as most other music videos that have some effort into them.
R&B and Hip Hop? You bet that's commercial.... every second cut is them looking at their fancy new cell phones in neatly placed marketing positions, fancy cars, clothing..... oh and let's not forget:
Gangsta Ice Creams!!!