Copyright is the biggest headache.
Usually, when I’m creating a Media product and I need music or a soundtrack for it, I tend to not bother with bands that are with a big company like Sony or whatever. I always look at places like Triple J Unearthed for many reasons. Firstly, it is that it’s much easier to get permission from these artists to use their music and usually you can just get (unofficial) permission from them through a Facebook message. Secondly, they usually offer it to you for free as they just want their music heard which I think is admirable. And finally, I’m a big supporter of underground music and especially Australian music, so if the use of their music in some stupid video I make helps out, I am more than willing. Really, no point signing forms and paying heaps of cash to some fat corporation when you can actually get good music for free and easily elsewhere.

Anyway, keep your options open, you don’t always need a One Direction track for your videos.