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She has appeared as a backing vocalist on music by artists including Go West , Simple Minds , Adam Rickitt , Robbie Williams , Cher , Bo Selecta , Swing Out Sister , Sheena Easton , The Blow Monkeys and most frequently Pet Shop Boys .
 Adam Rickitt, Robbie Williams, Cher, Sheena Easton
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Adam Rickitt, Robbie Williams, Cher, Sheena Easton