What are the main functions of a music video?

What are the main functions of  a music video?

To start off the project, I thought it would be best to make a mind map of the basic functions of a music video.
Main Functions:

• To make a connection with the audience.
• To spread the artists music and spread artist themselves across different media types.
• To make more money and increase sales.
• To make the artist well -known.
• To identify the audience.
• To target a specific audience.
• The message/moral of the song is more clear and understandable.
• General promotion.
• Familiarises the audience with the artist.
• A chance for product placement.

Examples...

Beyonce released her new single 'Love on top'(2011).. 

• She makes a connection with the audience as the camera is always focused on her and the use of mid-shots, close-ups and eye contact makes it more intimate for the audience. 
• This spread Beyonce's music worldwide, and was played on TV (MTV) urban and mainstream radio, digital download (itunes, youtube converter) and Contemporary hit radio.
• Beyonce made money out of this video, as it obviously has a reasonably low budget, as it was produced in a NY penthouse with five male back up dancers. As a result, 'Love on top' was in the UK single charts at no. 13 and UC charts at no. 20. Therefore, Beyonce made money and increased sales of the single and her album, 4. 
• Beyonce is one of the worlds most famous pop/R&B artists, therefore, this simple set and scene was enough to promote herself. 
• The audience is definitely targeted in this video. 5 male back up dancers are used. It is set in the busy city of New York. This suggests a young, female audience. Beyonce is dressed in a provocative tight leotard, which suggests a more young male audience.