Usher  usually gives a great live show, but due to illness he could not perform.  Watch the video for yourself.

It was not Usher's finest moment.
Forced to cancel his Wednesday concert at Berlin's 02 Arena at the last minute due to illness, the "OMG" singer, 32, rescheduled the show for the next night and promised his fans, via Twitter, "the show that you all properly deserve."

www.people.com/people/article/0,,20457813,00.html