Avada Kedavra Fucking A.
Very excellent work, alot of detail, and nice additions to make the song more entertaining than it already was. Nicely done.
!!SPOILER ALERT!!
To get into the hidden scene, go to the library bit, and pause at the moment Voldemort first says "Avada Kedavra" after opening the library up. Theres a book called "Ferret Flight". Click it.