Here's something more mainstream that's kinda like an epic. Everyone loves this song and so do I!
If anything, you have to watch the video all the way through (if you haven't). I showed my kids and they loved it. My 6-year-old even wanted to see it a second time and she got teary-eyed.
"Radioative" by Imagine Dragons
http://www.youtube.com/watch?v=ktvTqknDobU#ws (Embedding disabled, limit reached)