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In the mid to late 1940 s , recording engineers and experimental musicians such as Les Paul began manipulating reel-to-reel recording tape to create echo effects and unusual , futuristic sounds .
 person: Les Paul
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Les Paul 
Answer:
 person: Les Paul