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Two 's Company The Duets is a 2006 studio album by Cliff Richard featuring various duet s he has recorded with other recording artists , including Elton John , Barry Gibb , Dionne Warwick , Olivia Newton-John and Lulu .
 person: Cliff Richard; person: Elton John; person: Barry Gibb; person: Dionne Warwick; person: Olivia Newton-John; person: Lulu
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Cliff Richard, Elton John, Barry Gibb, Dionne Warwick, Olivia Newton-John, Lulu 
Answer:
 person: Cliff Richard; person: Elton John; person: Barry Gibb; person: Dionne Warwick; person: Olivia Newton-John; person: Lulu