runouw.com

This guy basically gets an orchestra to perform various copyrighted pieces, and they sound epic.
Nyan Cat
Super Mario World castle
Flight of Robotnik
Fullmetal Alchemist Brotherhood

And he also does some original pieces.
Adventures in your Sleep
Dexter in the Dark

This is like ZREO for a wider audience, innit?

Holy crap...the Nyan Cat one is epic. I feel like I'm at a fancy theme park :3

This man is a musical genius, I must say.

New ones:

Minecraft Calm
Pixel Hero 2
Songify This
RuneScape
Rick Dangerous

Fullmetal Alchemist?!
Minecraft?!
Super Mario World?!

*faints*