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While working as a vocalist at All India Radio , singing the songs of Devulapalli Krishna Sastry and Viswanatha Satyanarayana , he met and married a fellow singer named Renuka .
 Devulapalli Krishna Sastry, Viswanatha Satyanarayana
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Devulapalli Krishna Sastry, Viswanatha Satyanarayana