Actually it is the music that is made before the music video so your real question should be why does the music video have to relate to the music. The answer to your question though is because if it...
Yes
Two have been aired so far: Ready, Set, Go and Monsoon.
The Buggles made "Video killed the radio star," the first video to be broadcast on MTV.
Apply to TV channels, have a few dancing qualifications, be really pretty