Do you know what this song originally is?

Yesterday,I posted 2 video on YouTube,and one of them is talking about what this topic about : Do you know what this song originally is?

"I don't think any people can actually know what this song is..."

"Tip:
-I have changed the pitch,speed of the original song,and reversed it,so you may want to imagine a higher or lower pitch and speed,and reverse this song again..."

If you really don't know what it is,don't worry.I will make a vid on how I changed this song,and what's the name of it.

Wanna download that song?Try this link:
http://ioxcsq.blu.livefilestore.com/y1pGCqIzxn3KUeLO9JzPYsIFCeIESkRZ9wlufHDFXm2Q5Zbqcwo8nJWxfG0fimtS9PEWxRQAmysxfbBdQ7H2J01Uq1PaFSMWevw/Untitled.mp3?download

OR...

Watch the vid: