Who sings the D-Generation-X theme song?

No

People seem to think it's from Rage against the Machine. But it isn't. The song is by the "Chris Warren Band" or sometimes referred to as "the DX Band". The song is called "Break Bt Down" The real answer is on the Raw soundtrack and singer is Jim Johnston and Chris Warren the name of the song is "Are you Ready" had to do some extra looking to find that one! But that's the real song! Jim Johnston is Awesome

It's obviously done in a style which mimics Rage Against the Machine but if you look at that band's history it is extremely unlikely that they would do something as frivolous as that.

I think it is R.A.T.M