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This was the group 's first album ( of two ) for Warwick Records , which released a series of albums alongside this by various other artists in the lead up to Christmas - Sing 20 Number One Hits being one of the most successful of these .
 Warwick
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Warwick