What the title says, i need to find the song off vocals, but i have only practiced Neko's version of the song :\
And i dont know how to extract the voice from the song, and if u r going to tell me, it would help if u were a mac user...

Well Hey fellow mac user! You can use a program called audacity, which should be on macs, and if you don't have it, you can just google it and download. Here's a video:

(It's cool cuz he's british)
http://www.youtube.com/watch?v=JEjzdurnJhw

Also know that will only extract the lead vocals, and you might be able to hear the echoes from the voice.