Beyonce - Single ladies, i believe is a good music video because there is a clear message and the audience know exactly what is going on as the action in the chorus matches the lyrics. The video is in black and white so this makes it different and simple. The music video consists of women alone and the song is about 'single ladies' therefore Beyonce has evidently thought about the concept of the video and the type of people she wants in her video.
Beyonce was once in a group 'Destinys child' and was the lead singer however, the group split up and she has gone solo and is most girl's idol.  This video is extremely popular with the ladies. The songs she produces usually represent for the ladies giving off the message that we are independent so as she has a positive effect on women.
The music video makes use of key conventions such as lip synching. I know she is lip synching because she dancing throughout the video and her vocals sound absolutely perfect, the camera never zooms into her lips or it would be obvious to the viewers.
The camera is in focus on Beyonce during the whole video, there is not many cuts within the video however, the backgrounds do change constantly. This effectively keeps the view interested.