Teaser vids

Its not just the film industry that uses the concept of teaser (trailers), but also the music biz. These are used to build up interest/excitement/anticipation - and attention; press reportage - in advance of a release. They also present an opportunity to give different websites 'exclusives' - one the teaser exclusive, another the full vid, or a making-of (and so forth).
I've noticed quite a few of these, and here's one example (a horror-themed metal vid): http://loudwire.com/love-and-death-chemicals-video-teaser/