7852
From 1952 to 1957 , he was best known as a vocalist on " Your Hit Parade " , an NBC television series that reviewed the popular songs of the day and on which a regular cast of vocalists would perform the top seven songs of the week .
 organization: NBC
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:
 organization: NBC