What is the "Group Song" Content?

New user working with Magazine Pro, and I'm trying to figure out where the demo content is coming from so I can change it. Right now, I'm seeing posts for "Group Song", "Sports Car", "Landscape"... ect on the home page. I've spend the past couple of hours going in and out of sections and trying to understand the theme instructions... but haven't had any luck locating it. So my question: what exactly are those elements, and how do I change them? www.ndfilmmaker.com Thanks!