This composer of Living Room Music wrote a work whose score consists of six transparent squares that can be combined in any way and belongs to a group also containing a work "for any number of players and any sound-producing means".  
The movements of one of this man's works include "Story", "Melody", "End" and "To Begin" and is a quartet for unspecified instruments, and the second movement consists entirely of overlapping voices quoting Gertrude Stein's "The World is Round".  This composer of Living Room Music wrote a work whose score consists of six transparent squares that can be combined in any way and belongs to a group also containing a work "for any number of players and any sound-producing means".  This composer of Variations I-VIII wrote a work whose first performance is scheduled to end in the year 2640, and a more well known work in three movements that consists of the sounds of the environment of the performance.  For 10 points—name this composer of many works for prepared piano and the compositions As SLow aS Possible and 4'33".
The movements of one of this man's works include "Story", "Melody",
John {Cage}