What is a music video?

Music video is a piece of art work, a piece of visuals put together in order to either illustrate, amplify or contract the music (based on Goodwin's theory) which is used to attract the audience. So therefore the music usually goes together with visuals (including when images/shots are changing to the beat). There is usually some kind of relationship between lyrics of the music and the visuals.
Usually when it comes to the music video, it is either narrative, performance or concept based, which simply means if it is performance based it is usually rock genre music where you can see the band performing on the stage, you can see the crowd and other genre conventions. Narrative based videos now became pretty 'fashionable' to do, in order to sell the music, the artist chooses the direct which could create a video like a small TV film, and in the end there is a concept video which means the visuals might have no relation to the lyrics of the music at all, it might simply be just landscapes matching the change of shots to to the beat (Goodwin). This music video is usually used with house or electro dance music. Pop music videos usually are song and dance number based such as Britney Spears - Hit me baby one more time, where the music video is purely based on the main vocalist and the dance group (according to Gow's theory). In such videos usually there is a lot of voyarism (seeing people through reflections on water, mirror, through another camera or window). Well known artists even have their own iconography that they are recognized through, for example Britney Spears is always expected to be seen with the group of dancers, always teasing and having a lot of close-ups to her face, the use of sexuality in the video.