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He is known for his baritone voice , which has been described as being " as scratchy as a three-day beard yet as supple and pliable as moccasin leather " and has been compared to Leonard Cohen and Tom Waits .
 Leonard Cohen, Tom Waits
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leonard Cohen, Tom Waits