Knowledge of music videos:
Usually includes the artist
Has a story line:
'Teenage Dirtbag' - tells a story of a high school loser getting the girl of his dreams.
Normally lip syncing and dancing:
dance routines normally used in boyband's videos like JLS and One Direction
Sometimes show the band performing live:
30 Seconds To Mars - 'Edge of the Earth'
Can normally cost a lot of money: up to millions of pounds/dollars.
So far as I know, the main reason for music videos is for entertainment purposes. However through music videos, the artist(s) are being advertised, promoting their music. By doing this, it makes them make very glamorous and over-the-top music videos to get people interested in them and make them remember the artist(s).
