How can videos be judged to be sucessful?

If the music video encourages a consumer to buy the music track, or even the video, which can be downloaded onto some mp3 players, then it can be concluded that the video may have been successful in promoting the video and being memorable to the audience. It maybe also influences new trends, depending what occurs on the video. If the music video has an impact it will be spread via word of mouth, and if it is controversial then media will talk and give critical reviews. Such as the Madonna music video for ‘Like a Prayer’ which featured Madonna with Saint Martin de Porres, which was perceived as a black version of Jesus Christ .