2299
The Whiffenpoofs performed the song on The Sing-Off on 6 December 2010 .
 organization: The Whiffenpoofs; organization: The Sing-Off
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: The Whiffenpoofs; organization: The Sing-Off