[tptacek]

It apparently happens enough that they have to mention it:

MAKING IT YOURS

And remember, don’t use music, images, video, or other content that you don’t have the rights to. Using copyrighted material is almost always illegal and can lead to expensive lawsuits down the road. The easiest way to avoid copyright troubles? Either create all the content yourself or use content that is free for public use. For example, you may be able to use some Creative Commons-licensed music — per the terms of their licenses — that's available on SoundCloud. Other resources you can explore: Vimeo Music Store, Free Music Archive, and ccMixter.