1. 
   heterophonic
   two or more musicians performing the same melody at the same time but embellishing it in different ways. Heterophonic performances, for example of troubadour and trouvère repertory, can be aurally exciting, but little documentary evidence supports them; they reflect modern hypotheses about what a m...
   Found op http://people.vanderbilt.edu/~cynthia.cyrus/ORB/orbgloss.htm
   
   
2. 
   heterophonic
   heterophony, heterophonic, heterophonous Simultaneous performance by two or more singers or instrumentalists of different versions of the same melody.
   Found op http://www.wordinfo.info/words/index/info/view_unit/2737/6
   
   

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