I've had 3d animation instructors point this very thing out in class:
Don't take a 15 minute long song (12 in this case) and just string endless footage over it.
It doesn't work. You're not creating a story, you're not showing something off, you're not teaching (i.e. showing cool manuvers, whatever), you're just stringing endless clips together for 12 minutes.
If you're doing a music video, best to keep it under 5 minutes (LESS if possible).
Here's an example. For all those that want to start editing, do a ***30 second*** video first! Make it have a beginning and an end!
If you can pull that off, you're on your way.
Much as I like Pink Flloyd, I couldn't watch much past the 3 minute mark on dugy's film.