Is it legal to do this?

[Deathtank]

http://www.youtube.com/watch?v=w0VHRfJucac&feature=fvsr
O_O?

[Meteo Xavier]

Its only illegal if you get caught...

...posting it to a widely public area.

[The Damned]

I hope his first name is Lou. That would be the awesomest name ever!

But unless I'm missing something (like he outright stole it), isn't this no different from what pretty much every remixer on this does?