Chris replies to me:

>>Yep.  I've recently (within the past year) heard the original version
>>of Ballet mecanique (MUCH better than the revision).  One of the most
>>extraordinary pieces of this century. ...
>
>I don't know the piece well. Did both versions have an airplane propeller?

No.  The later version does not.  However, what makes that piece for me is
not what sounds, but what doesn't.  It's one of the most spectacular uses
of silence I've ever encountered.

Steve Schwartz