I don't know how Megan stumbled upon this, but I thank Zeus for her finding it. She and I just watched the first two parts of it (I should explain for any who are confused that I work with Megan and we share a prison cell of a cubicle in the back corner) and I can't wait to get off of work so I can finish the whole thing. Anyway, it is too good for me not to share it, and, given the Harry Potter theme today, it seemed more than fitting.
I give you... A Very Potter Musical pt. 1 (go to youtube and search "Very Potter Musical" to find all the rest of it).