200962
The famous waltz theme in particular gave Khachaturian much trouble in its creation : moved by the words of the play 's heroine , Nina - " How beautiful the new waltz is !
 Khachaturian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Khachaturian