Neil Diamond performed "Sweet Caroline" in a surprise appearance on Saturday at his namesake musical, "The Neil Diamond ...

Diamond has surprised fans with performances of "Sweet Caroline" through the years, including a massive sing-along in Times Square for New Year's Eve in December 2017.

At a recent performance of A Beautiful Noise: The Neil Diamond Musical at the Hollywood Pantages Theatre in Los Angeles, Neil Diamond led everyone in a sing-along of 'Sweet Caroline.' Check out ...

Neil Diamond performed "Sweet Caroline" in a surprise appearance on Saturday at his namesake musical, "The Neil Diamond Musical: A Beautiful Noise," in Los Angeles.