Artist usually release a single to promote their new album which has just come out they usually, release their music video so it gets people talking about their songs, so in other words its so they can make their albums herd. One person who done this was dappy from the group n-dub z he released a music video called Good intentions and that music video was meant to promote is album Bad intentions.
To create a visuel representation of an artist
This allows the artists to chose the way they want themselfes to be seen for instance, thier personality their looks etc., This also always artists to enhance their brand for instance their record labels and their albums they might be selling, for instance Big narstie is a uk street artist who raps about pain, and his persoanlity in his music video represents how life really is, and his looks represents those who gangbangs with his mates.
To provide additional income from a video
The music industry get additional income through extended playability, which an artist is seen in the public eye,one of the songs that represents this is Iyaz replay, is was a single hit release which represents how record company's add to their income and make good success, they also receive income from ads that are on websites when they hit certain amount of hits, however they also make a lot of money from single releases on cds this is because they are able to put exclusive pre-releases which can promote an new single coming out for an artist.
To create synergy with other media
The music industrys create's synergy to gain additional income and to make their record label herd, this means they combine with film trailers for instance the trailer might use a new pre-leased song from an artist or it might include clips from the film but have the music artist in it. There is one tv advert which shows synergy very well Its one with professor green and relentless engergy drink working together, this promotes professor greens musci career and at the same time it maked relentless engergy drink more known and competetive against its rivals.
To be art in their own right
Some music video's contain enigma which sometimes is more memorable then the music video itself which promotes the record label, in different ways first off all i found a video which creates an emotional enigma with the music lyrics go with it its called Micheal jack son heal the word