Steven J. Horowitz Senior Music Writer Over the past few months, Justin Timberlake has been staging one-off shows across the United States in anticipation of his new album “Everything I Thought It Was,” out this Friday, bringing lively performances to his native Memphis and New York City. But those who were lucky enough to snag a free ticket to attend his “One Night Only” show on Wednesday (March 13) at The Wiltern in Los Angeles got a once—or, technically, twice—in-a-lifetime experience, as the pop singer reunited with his group NSYNC to perform for the first time since 2013.