Neil Diamond sang "Sweet Caroline" at the opening of "A Beautiful Noise," a Broadway musical based on his life. The 81-year-old singer has Parkinson's disease.

Neil Diamond Surprises Broadway Audience with Rare Performance of 'Sweet Caroline' — Watch! Neil Diamond's impromptu performance marked the first time the music icon has performed in his ...

Diamond later said in a 2014 interview that he actually chose Caroline while hunting for a three-syllable name to fit in a song he’d written about his Marcia, his wife from 1969 to 1996.