Yea, she can't sing very well
no he is too good for that
Yes
There are rumors that she does yet to answer your question, I say no Miley Cyrus does not lip sink.
I believe it is a relative thing, and depends on what you want. If you want the artists to sound amazing and just like the record, (AND if you also want them to dance like Brittany, Beyonce, etc) then yes, they will lipsynch and if what you want is a "good show" meaning the entertainment value of the sets and the dancing, then it isn't horrible. It's almost expected. Whenever a star who dances a lot does NOT lipsynch people can usually tell by how breathy they are etc. If you go to see a concert and want to hear the band though, then yes, it's freaking horrible.
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Beyonce Knowles
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Her full name is Beyonce' Giselle Knowles. Beyonce' is her mother's maiden name.
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Beyonce's mother Tina Knowles (nee Beyince) Beyonce's father Mathew Knowles Beyonce's sister Solange Knowles Beyonce's cousin Angie Beyince Beyonce's daughter Blue Ivy Carter Beyonce's husband Sean Carter