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Sylvia has also toured extensively with Pet Shop Boys , including Glastonbury 2000 which they headlined , Live 8 in 2005 , their extensive 2006/2007 Fundamental World Tour as well as their month long residency at the Savoy Theatre in 1997 , their 2006 BBC Radio Theatre & Radio 2 concerts , and their iconic 1991 Performance World Tour .
 Sylvia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Sylvia