Michael Jackson hasn’t performed in so long, he’s almost forgotten how. Thank goodness for YouTube, which Jacko has been using to brush up on his trademark moves before returning to the stage in July, the Sun reports. “It’s over a decade since he performed a full-length show,” a source tells the tab. “He’s watching all the old performance footage he can find in a bid to be on the form of his life this summer.” (More concert tour stories.)