(FOX NEWS) -- Neil Diamond surprised the crowd at the opening night of "A Beautiful Noise, The Neil Diamond Musical" with an impromptu performance of "Sweet Caroline."
The 81-year-old music icon led theatergoers in a singalong of his 1969 megahit during curtain call at the Broadhurst Theatre in New York City on Sunday night.
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"I don’t know who needs to hear this but Neil Diamond, who retired from performing five years ago because of Parkinsons, just had a Broadway show of him open and it at the opening night he did this," a social media user tweeted along with a clip of Diamond's performance at the show.