Rythmic-Motion Synthesis Based on Motion-Beat Analysis 
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This paper describes a system for generating dances given a piece of music  
First, we train the system using a collection of motion files that we know  
represent dancing, and we know the type of each dance.  
  
We group motion of the same kind of dancing. The first step is to find the  
beat interval. Now, we build a motion graph, where each node represent  
the dance movement for a beat.  
  
Now, we impose a markov model over the system. We build it using the  
Maximum Likelihood estimator for moves as perfromed by the actor.  
  
Finally, to produce a dance, we parse the music. We do motion warping to  
the movements to make the motion time equal to the beat interval. This way  
the character movements will be synchronized with the music.  
  
That was a nice paper to read. And it looks like the system can be used  
in other things than dancing.