When watching a band perform their latest hit in a music video, it is often dull and uninteresting. But when the song is proprietary — that is, unique to the video — something changes. And when the unique song is accompanied by cinematography that has the occasional wobble, giving the appearance of amateur, the greatness is heightened yet again. Both these elements are highlights in the latest Anna Ternheim video, an acoustic version of “What Have I Done” featuring Bjorn Yttling of Peter Bjorn & John fame. …