23749
The Leslie speaker , most commonly associated with and predominantly used with the famous Hammond organ , takes advantage of the Doppler effect by using an electric motor to rotate an acoustic horn around a loudspeaker , sending its sound in a circle .
 Hammond
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hammond