I have to say I'm really loving Animoto ( https://animoto.com/ ). I've been using video slideshows to showcase my wedding photography for a few years now. Up until now I've been using iMovie on the mac and then licensing music through Song Freedom or Triple Scoop. This was working ok but it was quite hard to find the right music and sometimes pretty expensive to licence ( up to £60 for some tracks ). It was also fairly time consuming. Animoto isn't free, the basic package is £95 per year, but given the amount of music you get with that, and how easy and fast it is, I'd day its very good value. So far I've knocked up a couple of slideshows, one for Instagram and one for YouTube and I can see myself doing a lot more of these now. Here is one which is quite short ( less than a minute ), showcasing some of my fashion shots from two shoots I did a few months ago.