<iframe src="http://gfycat.com/ifr/JauntyWearyDutchshepherddog" frameborder="0" scrolling="no" width="600" height="338" style="-webkit-backface-visibility: hidden;-webkit-transform: scale(1);" ></iframe>

I hear Bungie is adding DDR pad functionality in the final game.

<iframe width="560" height="315" src="//www.youtube.com/embed/gAHIoC-1odg?rel=0" frameborder="0" allowfullscreen></iframe>