Beyonce's concert at the Barclays Center in August is rumored to...

... ork. She performed for the first time since hip surgery. She sang a duet with jazz singer Brian Newman at the Gramercy Park Hotel's Rose Bar. They performed "Someone to Watch Over Me."

http://thecelebritycafe.com/feature/2013/05/beyonce-s-concert-barclays-center-august-rumored-include-special-guests-lady-gaga-ja