six degrees of connection (21)

Who connects the four images
above?
RULES:
1) Please do not leave your
answers in Facebook's comment
section!
2) To participate, please send us
(a) who connects these images
and (b) how does he/she connects
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3) All correct answers will be
added to a random draw where
we'll be picking out 5 lucky
winners.
4) This contest closes on
December 22nd, 2012 - 5PM.
5) Winners will be announced on
December 26th, 2012.
6) Winners will receive gift
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please provide answers.. i will give rep

 

contest is already closed. Yanni is correct answer.

 

how it connects them?

 

he has performed in all places shown, forbidden city Beijing, some fort in San Juan, Moscow and burj khalifa dubai