Instructables
this instructables will have two main parts. the first is making the ghosts and the second is making the robot and rigging the ghosts to "dance". The project is simple but it may take a lot of trail and error to get the ghosts' movement to match the beat of your chosen song. you can also just make the ghosts without the robotic parts if  you do not have a mind-storms set available to you.
 
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Step 1: Materials

Picture of Materials
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fabric ghost:
     -scraps of organza fabric (any white fabric would work but organza look more "ghostly")
     -cotton balls
     -fishing line or thicker thread
     -somewhere to mount a hook up high
     -a hook
      -a safety pin
Dancing mechanism:
     -a Lego mind-storms motor
     -some random Lego pieces (a list will be shown later)
     -some more fishing line or thread
     -zip ties
     -Mind-storms logic brick
     - a computer with mind-storms program writer
     - a place to mount the mechanism

Step 2: Making the Ghost's body

Picture of Making the Ghost's body
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to make the ghost's body start by draping the fabric over your hand and try to get it as even as possible. next grab a handful of cotton balls and hold it in your fabric covered hand a flip your hand upside down. pinch under the fabric and tie a not to hold the ghost shape. you can also use a rubber band or a twist tie.

Step 5:

Picture of
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the ghost is finished but now lets make the dancing mechanism! gather all your Lego pieces and put together the "arm". follow the illustrations bellow