Be far less impressed then because ITG was the one with Machinae, not DDR.
But this other game supposedly makes steps to any CD, so I imagine you could put DXM or Redeemer in there and dance away. Like I said I'll try and get the name of the game tonight.
I'm aware ITG had the machinae songs =P
But my point was, it said you could upload content. Which lead me to believe you could make your stepfiles (and songs) in the tune of StepMania, for example (which may be what youre talking about. StepMania lets you make songs and steps at your leisure - I have tons of StepMania stepfiles).
It should also be noted Konami does DDR. Konami purchased ITG and shut it down for the most part. The thought the songs may transfer to DDR is highly possible as they probably have the right to use them now - So the idea of DDR shipping with a Machinae song or two seems possible to me.
But like I said, I was talking about the uploadable content stuff ala StepMania, where you can make your own steps to a song of your choice and share with the world - which would be an absolutely fantastic feature for the 360 and DDRUniverse.