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After experimenting with electronic music in Cologne , his breakthrough came with orchestral works such as " Atmosphères " , for which he used a technique he later dubbed micropolyphony .
 location: Cologne
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 location: Cologne