Since the 1920's when the first early music videos were released there main aims were to keep the viewer interested, they use various techniques to achieve this one is keeping the video fairly short and by using controversial content within the video.
Almost every music video is 3-5minuets long this keeps the viewer interested and involved anything longer than this means the viewer is likely to get bored and tune out, therefore video is normally compressed if it is any larger. They keep the videos short also so the producers can play as many music video as possible in an allocated time. Since the development of music videos they've learnt that viewers now are passive therefore aren't 100% focused on the video. Due to producers being aware of this they use controversial images, rapid cuts, slow motion, celebrities. Due to music videos following the pattern of being 3-5minuets long they don't have time to develop characters, instead we build up stereotypes and characters follow plots in accordance to the song. Music videos tell a story by editing clips together, these clips make little sense on there own.